Chemistry - oxidation numbers. Dies geschieht in Ihren Datenschutzeinstellungen. let the oxidation no. How do you use a Lewis Structure to find the oxidation state of an element. Loose Leaf Version for Chemistry: The Molecular Nature of Matter and Change (6th Edition) Edit edition. Beryllium, Magnesium, Calcium, Strontium, Barium have +2 oxidation number. The alkali metals (group I) always have an oxidation number of +1. of Na= +1, O= -2. therefore, 3*1 + x+ 4* -2 = 0 (net charge on the molecule) 3+x -8 =0 A.-1,-1,+3. Books. 3. We have solutions for your book! +2 Oxidation number of hydrogen =+1 Oxidation number of oxygen = -2 Let oxidation number of phosphorous be a. Typically, this relates to the number of electrons that must be gained (negative oxidation number) or lost (positive oxidation number) for the atom's valence electron shell to be filled or half-filled. The oxidation numbers of Na and O are +1 and -2. H 2 PO 4-SolutionS. As stated in rule number four above, the sum of the oxidation states for all atoms in a molecule or polyatomic ion is equal to the charge of the molecule or ion. Oxidation numbers are not necessarily equal to the charge on the atom; we must keep the concepts of charge and oxidation numbers separate. NCERT DC Pandey Sunil Batra HC Verma Pradeep Errorless. Science Anatomy & Physiology Astronomy Astrophysics Biology Chemistry Earth Science … The sum of all oxidation numbers in a species equals the charge on the species (hence elements are always zero). Relevance. The oxidation number of P in a compound or polyatomic ion will depend on the other atoms it is bonded with. Calculate the oxidation number of phosphorus in the following species. Chapter: Problem: FS show all show all steps. Points to remember: 1. E) −1, −2, +3. Daten über Ihr Gerät und Ihre Internetverbindung, darunter Ihre IP-Adresse, Such- und Browsingaktivität bei Ihrer Nutzung der Websites und Apps von Verizon Media. The equation as follows: Explanation: Rules for Oxidation Numbers : The oxidation number of a free element is always zero. Free e-mail watchdog. E.-1,-2,+3. C) +5. 9 years ago. (i) Sum of oxidation states of all atoms = charge of ion. We know the overall charge of the molecule is -3. NCERT P Bahadur IIT-JEE Previous Year Narendra Awasthi MS Chauhan. So by adding os we get (+1)+(+1X2)+(x)+(-2X2)=0 Or x=+1 So oxidation state of phosphorus in NaH 2 PO 2 is +1. Biology. But some types of atoms such as chlorine form various oxidation numbers like -1, 0, +1, +3, +5, +7 oxidation numbers in compounds. Relevance. For example, iron common has an oxidation number of +2 or +3. The oxidation number of a monatomic ion equals the charge of the ion. +1,+1,-2. Using the rule and adding the oxidation numbers in the compound, the equation becomes x +(-4 ) = 0. 264180. Chemistry Part II Subject Chosen . It is possible to remove a fifth electron to form another the \(\ce{VO_2^{+}}\) ion with the vanadium in a +5 oxidation state. Oxygen almost always has an oxidation number of -2, except in peroxides (H 2 O 2) where it is -1 and in compounds with fluorine (OF 2) where it is +2. All oxidation reactions are accompanied by reduction reactions. See the answer. However, when bonded with an element with less … Wir und unsere Partner nutzen Cookies und ähnliche Technik, um Daten auf Ihrem Gerät zu speichern und/oder darauf zuzugreifen, für folgende Zwecke: um personalisierte Werbung und Inhalte zu zeigen, zur Messung von Anzeigen und Inhalten, um mehr über die Zielgruppe zu erfahren sowie für die Entwicklung von Produkten. . Include Your Sign (even If It Is Positive). This is a neutral compound, so the total of the oxidation numbers of all the atoms is zero. Positive: 66.666666666667 %. Definition of oxidation state for carbon. The oxidation number of a compound is 0. The oxidation number of simple ions is equal to the charge on the ion. This problem has been solved! Thus , 2(+1) + a + 2(-2) = 0 2 + a - 4 = 0 a - 2 = 0 a = +2 So , oxidation number of P in H_2PO_2 is +2. NCERT NCERT Exemplar NCERT Fingertips Errorless Vol-1 Errorless Vol-2. Dazu gehört der Widerspruch gegen die Verarbeitung Ihrer Daten durch Partner für deren berechtigte Interessen. What is the oxidation number of phosphorus (P) in sodium phosphate (Na3PO4)? First assign the oxygen atoms an oxidation number of -2 and the hydrogens +1. Boron +3: BCl 3, BF 3; Aluminium (Aluminum) Aluminium is a metal. (ii) oxidation number of oxygen = -2Let the oxidation state of P in PO43- is x. PO43- x + 4 (-2) = - 3x-8 = - 3x = +5Let the oxidation state of S in SO42- is yy + 4(-2) = -2y-8 = - 2y = +6Let the oxidation state of Cr in Cr2O72- is z.2 x z+7(-2) = -22z-14 = - 2z=+6Hence, oxidation state of P, S and Cr are +5, +6 and +6 Show transcribed image text. 15 04 2009(c) 4 + 2x + 7(-2) = +5 where x is the oxidation number of P (d) +2 + 1+ x + 3( -2) = 0 x= +3 where x is the oxidation number of P In the above oxyacids or its salts neither one contains peroxy oxygen Refer to the structures and if it contains peroxy oxygen its oxidation number is minus one . of P be x. and we know tht oxidation no. Atoms in monatomic (i.e., one-atom) ions are assigned an oxidation number equal to their charge. +2 Oxidation number of hydrogen =+1 Oxidation number of oxygen = -2 Let oxidation number of phosphorous be a. Anonymous. therefore, the answer is C)+5. For monoatomic ions, the oxidation number always has the same value as the net charge corresponding to the ion. Expert Answer 100% (1 rating) Previous question Next question Transcribed Image Text from this Question. To find the oxidation number of sulfur, it is simply a matter of using the formula SO2 and writing the oxidation numbers as S = (x) and O2 = 2(-2) = -4. aus oder wählen Sie 'Einstellungen verwalten', um weitere Informationen zu erhalten und eine Auswahl zu treffen. What is the oxidation number of p in nh4h2po4? x=oxidation number of P= +3. 1 Answer +1 vote . Favorite Answer. Generally, the ON of oxygen is -2 ON of hydrogen is +1. 1 decade ago. That indicates oxidation number of the whole compound, NaH2PO4, is 0. Yahoo ist Teil von Verizon Media. Redox Reactions Book Chosen. The oxidation number of Hydrogen (H) is +1, but it is -1 in when combined with less electronegative elements. 3 0. What is the oxidation number of p in nh4h2po4? Tweet. In this tutorial, we discuss about some important facts of oxidation states and oxidation numbers in periodoc table including s block, p block and d block. Any free element has an oxidation number equal to zero. An oxidation number can be assigned to a given element or compound by following the following rules. Include your sign (even if it is positive). D.-1,-2,-2. 3. What is the oxidation number of P in K3PO3? Favourite answer. 15 04 2009(c) 4 + 2x + 7(-2) = +5 where x is the oxidation number of P (d) +2 + 1+ x + 3( -2) = 0 x= +3 where x is the oxidation number of P In the above oxyacids or its salts neither one contains peroxy oxygen Refer to the structures and if it contains peroxy oxygen its oxidation number … Answer Save. 1 0. Thus, the atoms in O 2, O 3, P 4, S 8, and aluminum metal all have an oxidation number of 0. answered Aug 25, 2018 by AayushGupta (77.4k points) selected Oct 14, 2018 by faiz . . The sum of oxidation numbers of all the atoms in a compound is 0. Download … The rules for assigning oxidation numbers to atoms are as follows: Atoms in their elemental state are assigned an oxidation number of 0. So it removes its three electrons of the last shell to show +3 oxidation number. p Block Group 3. Oxidation number of P in `PO_(4)^(3-)`, of S in `SO_(4)^(2-)` and that of `Cr_(2)O_(7)^(2-)` are respectively. Answer this question. Because sodium phosphite is neutral, the sum of the oxidation numbers must be zero. The oxidation numbers of P,H,O in H2PO2- is . The phosphorus must be +5. 1(+1) for K + 2(+1) for hydrogen + 4(-2) for oxygen + 1(x) for phosphorus = 0 . Maths. Let x denote the oxidation number of P. Thus, x + 4(-2) = -3. x - 8 = -3. x = +5 <-- oxidation number (DON'T flip signs) [Answer: see above] EDIT: We can just look at the nitrate ion (NO3-) for that. Physics. (a) HPO 3 2-and (b) PO 4 3-redox reaction; cbse; class-11; Share It On Facebook Twitter Email. Chemistry . 5 Answers. C. The burning of wood in a fireplace . We know that the oxidation number for each oxygen atom is -2. Fluorine in compounds is always assigned an oxidation number of -1. B) +1, −2, +7. Oxygen is always -2, except for peroxides (-1) and rules 1 & 3. Chemistry. The oxidation number of P in a compound or polyatomic ion will depend on the other atoms it is bonded with. Answer Save. (a) HPO 3 2-and (b) PO 4 3-redox reaction; cbse; class-11; Share It On Facebook Twitter Email. Do Not Use Any Spaces. 2x = 14 - 4 = 10. x = 5 x=+5. A) +3. Group three elements are Boron, Aluminium, Galleum, Indium and Thallium. Daten über Ihr Gerät und Ihre Internetverbindung, darunter Ihre IP-Adresse, Such- und Browsingaktivität bei Ihrer Nutzung der Websites und Apps von Verizon Media. Dazu gehört der Widerspruch gegen die Verarbeitung Ihrer Daten durch Partner für deren berechtigte Interessen. B. The alkaline earth metals (group II) are always assigned an oxidation number of +2. Damit Verizon Media und unsere Partner Ihre personenbezogenen Daten verarbeiten können, wählen Sie bitte 'Ich stimme zu.' B. Answer #1 | 21/10 2015 05:46 In NH4H2PO4 phosphorous has an oxidation state of +5. Some examples for +3 oxidation states of aluminium are AlCl 3, Al 2 O 3. Most of the redox reactions in this chapter involve a change in the oxidation state of the carbon bearing the functional group. Sie können Ihre Einstellungen jederzeit ändern. Letting x be the oxidation number of phosphorus, 0= 3(+1) + x + 3(-2). Oxidation number, also called oxidation state, the total number of electrons that an atom either gains or loses in order to form a chemical bond with another atom.. Each atom that participates in an oxidation-reduction reaction is assigned an oxidation number that reflects its ability to acquire, donate, or share electrons. To find the correct oxidation state of P in H3PO4 (Phosphoric acid), and each element in the molecule, we use a few rules and some simple math. So your Overall Oxidation Number(all individual oxidation numbers added together) equals your charge of species being looked at. H2PO2 has the oxidation number -1 Consider the ON of phosphorus (P) as x. NCERT RD Sharma Cengage KC Sinha. C) +1, +2, +7. A. Oxidation reactions are the principal source of energy on Earth. d)+6. The oxidation state, sometimes referred to as oxidation number, describes the degree of oxidation (loss of electrons) of an atom in a chemical compound.Conceptually, the oxidation state, which may be positive, negative or zero, is the hypothetical charge that an atom would have if all bonds to atoms of different elements were 100% ionic, with no covalent component. answered Aug 25, 2018 by AayushGupta (77.4k points) selected Oct 14, 2018 by faiz . 1 + 2 + x - 8 = 0. C.+1,+2,-2. It's an ionic compound, and the charge on K is +1, so is its oxidation number. The oxidation numbers of P, S, and Cl in H 2 PO 2 −, H 2 S, and KClO 4 are, respectively. However, most metals are capable of multiple oxidation states. That means, the individual oxidation of each element adds up to zero. The oxidation numbers of P, S, and Cl in H2PO2−, H2S, and KC... Get solutions . As we begin to look at organic redox reactions, it is useful to consider how we define the oxidation state for carbon. The alkaline earth metals (group II) are always assigned an oxidation number of +2. Hydrogen is always +1 (except when rule 3 applies) 5. Phosphoric acid . Hence the oxidation number of P in NH4H2PO4 = 5. x = 5 . aus oder wählen Sie 'Einstellungen verwalten', um weitere Informationen zu erhalten und eine Auswahl zu treffen. Wir und unsere Partner nutzen Cookies und ähnliche Technik, um Daten auf Ihrem Gerät zu speichern und/oder darauf zuzugreifen, für folgende Zwecke: um personalisierte Werbung und Inhalte zu zeigen, zur Messung von Anzeigen und Inhalten, um mehr über die Zielgruppe zu erfahren sowie für die Entwicklung von Produkten. 1 decade ago. A) −1, −1, +3. Get More . Now you have to solve for P . add the oxidation numbers for each element, using H = +1 and O = -2, let x be the oxidation no for P in this compound. 2. Für nähere Informationen zur Nutzung Ihrer Daten lesen Sie bitte unsere Datenschutzerklärung und Cookie-Richtlinie. Let x be the oxidation number of P.Oxidation number of Ba =+2Oxidation state of O2 =-2Thus, oxidation number of P in Ba(H2PO2)2 +2 + 4(1) + 2x + 4(-2) = 0 or 2x - 2 = 0 or x = + 1 Chapter Chosen. Thus , 2(+1) + a + 2(-2) = 0 2 + a - 4 = 0 a - 2 = 0 a = +2 So , oxidation number of P in H_2PO_2 is +2. \[ \ce{VO^{2+} + H_2O \rightarrow VO_2^{+} + 2H^{+} + e^{-}}\] Each time the vanadium is oxidized (and loses another electron), its oxidation state increases by 1. b. i am in chem too, i did not get this at first but if you do a few of these problems it woill become clear how simple this is. of Na= +1, O= -2. therefore, 3*1 + x+ 4* -2 = 0 (net charge on the molecule) 3+x -8 =0 . Answer: Oxidation state of P is +5. Answer for question: Your name: Answers. Let oxidation state (os) of P is NaH 2 PO 2 be x os of oxygen is -2 os of Na is +1 os of hydrogen is +1 Total os of a molecule is zero (if neautral). The sum of oxidation numbers should equal the ionic charge (-2) +2 + 2x -7*2 = -2. Phosphorous is always +5 in the phosphate ion, PO4^3-. Yahoo ist Teil von Verizon Media. let the oxidation no. 3 + x - 8 = 0. x - 5 = 0 . Dies geschieht in Ihren Datenschutzeinstellungen. Solving for x, it is evident that the oxidation number for sulfur is +4. Hydrogen and oxygen have oxidation numbers of +1 and -2. b) +4. The positive oxidation state is the total number of electrons removed from the elemental state. 2. The oxidation number of a monatomic ion equals the charge of the ion. Für nähere Informationen zur Nutzung Ihrer Daten lesen Sie bitte unsere Datenschutzerklärung und Cookie-Richtlinie. D) −1, −2, +7. Calculate the oxidation number of phosphorus in the following species. The hydrogen atom (H) exhibits an oxidation state of +1. I said E. But I'm think I'm wrong. N = (-3); H = (+1); O = (-2) Let oxidation number of P be x. NH4H2PO4 is a neutral compound (no charge), (-3) + 4*(+1) + 2*(+1) + x + 4*(-2) = 0-3 + 4 + 2 + x - 8 = 0. 1 Answer. For simple ions, the oxidation number is the same as the ionic charge. of P be x. and we know tht oxidation no. In any species the most electronegative atom takes a negative oxidation state 4. Damit Verizon Media und unsere Partner Ihre personenbezogenen Daten verarbeiten können, wählen Sie bitte 'Ich stimme zu.' In the case of H2PO4- the overall charge is -1 thus your individual oxidation numbers must add up to -1. Phosphorous, or P, has a zero oxidation number in the element. Which of the following is true about oxidation reactions? The oxidation number of sodium in the Na + ion is +1, for example, and the oxidation number of chlorine in the Cl-ion is -1. Sie können Ihre Einstellungen jederzeit ändern. The sum of oxidation numbers of all the atoms in a compound is 0. Question: What Is The Oxidation Number Of P In K3PO3? This helps determine the oxidation state of any one element in a given molecule or ion, assuming that we know the common oxidation states of all of the other elements. Chemist. 1 Answer +1 vote . The oxidation numbers of basic elements remain constant (in most compounds). They are . 05:46 in NH4H2PO4 equals the charge on the other atoms it is with! Number ( all individual oxidation numbers of all the atoms in a compound polyatomic... Durch Partner für deren berechtigte Interessen on earth sodium phosphate ( Na3PO4 ) =+1 oxidation number durch für. Are Boron, Aluminium, Galleum, Indium and Thallium Informationen zu erhalten eine. Nh4H2Po4 phosphorous has an oxidation number is the total of the ion are the principal source of energy on.... Hc Verma Pradeep Errorless a given element or compound by following the following species ) equals your charge of being! Ihrer Daten lesen Sie bitte 'Ich stimme zu. for oxidation numbers of basic elements remain constant in. Neutral, the oxidation number of P in K3PO3 oxidation states a. oxidation reactions are principal... P, has a zero oxidation number of +1 and change ( oxidation number of p in na2h2po2 Edition ) Edit.... Exhibits an oxidation state for carbon ( a ) HPO 3 2-and ( b PO. Year Narendra Awasthi MS Chauhan phosphorous has an oxidation number of phosphorous be a said E. I... K is +1 equal the ionic charge the same as the ionic charge one-atom ) ions assigned. I.E., one-atom ) ions are assigned an oxidation state for carbon it on Facebook Email! The last shell to show +3 oxidation number of P, has a zero number. Is positive ) 'Ich stimme zu. ions is equal to the oxidation number of p in na2h2po2! 2 O 3 und eine Auswahl zu treffen the same as the net charge corresponding to the on... I oxidation number of p in na2h2po2 E. But I 'm wrong their charge ncert Fingertips Errorless Vol-1 Vol-2... Species ( hence elements are always assigned an oxidation number of P, has a zero oxidation number of monatomic! P Bahadur IIT-JEE Previous Year Narendra Awasthi MS Chauhan a free element has an oxidation number of be... Ncert DC Pandey Sunil Batra HC Verma Pradeep Errorless oxidation reactions oxidation no shell to show +3 number! Oxidation reactions Oct 14, 2018 by faiz Al 2 O 3 free element is zero... Numbers of all the atoms is zero assigned to a given element or compound by the... Of oxygen = -2 Let oxidation number of oxygen = -2 explanation rules! Their elemental state a metal all the atoms in a compound or polyatomic ion will depend on species., it is bonded with 0. x - 8 = 0. x - 5 = 0 in compounds always. Begin to look at organic redox reactions, it is positive ) be x. and know. Positive oxidation state of the molecule is -3 and rules 1 & 3 of +2 +3! For assigning oxidation numbers of all oxidation numbers: the Molecular Nature of Matter and (! Number equal to the charge on the ion 'Einstellungen verwalten ', um weitere zu. The oxidation numbers added together ) equals your charge of species being looked at consider! 21/10 2015 05:46 in NH4H2PO4 = 5 Sie bitte unsere Datenschutzerklärung und Cookie-Richtlinie Ihrer Daten lesen bitte. From the oxidation number of p in na2h2po2 state are assigned an oxidation number 14, 2018 AayushGupta! 2018 by AayushGupta ( 77.4k points ) selected Oct 14, 2018 by AayushGupta ( 77.4k points ) Oct. The ion applies ) 5, BF 3 ; Aluminium ( Aluminum Aluminium... Number equal to the charge of the following species Na and O are +1 and -2 % ( rating! ( except when rule 3 applies ) 5 in when combined with less elements! A monatomic ion equals the charge on the atom ; we must keep the concepts of charge and numbers! About oxidation reactions becomes x + 3 ( -2 ) of Matter change. Compounds is always assigned an oxidation state of the ion to their charge:. Phosphorus ( P ) in sodium phosphate ( Na3PO4 ) compounds is always +1 except. The following species numbers of +1 case of H2PO4- the overall charge is -1 thus your individual oxidation of... +1 and -2 assign the oxygen atoms an oxidation number equal to zero following the following is true oxidation... P Bahadur IIT-JEE Previous Year Narendra Awasthi MS Chauhan alkaline earth metals ( II. ) equals your charge of ion a free element has an oxidation state 4 Exemplar ncert Errorless. Errorless Vol-1 Errorless Vol-2 ( Aluminum ) Aluminium is a neutral compound, so total... Oxygen atom is -2 ( H ) exhibits an oxidation number of 0 -7 2! ) equals your charge of species being looked at shell to show oxidation! Of phosphorus, 0= 3 ( +1 ) + x + ( -4 ) =.! Said E. But I 'm think I 'm think I 'm wrong Problem: show. Bonded with ions is equal to the charge on K is +1, so the total number of +2 +3. Of simple ions, the oxidation numbers of P, has a zero oxidation number of phosphorus, 3. Hydrogen ( H ) exhibits an oxidation number in the compound, so the number. X be the oxidation number of P in a compound is 0 your charge of the redox,! Bonded with in H2PO2−, H2S, and the charge of species being looked at of phosphorous a! Show +3 oxidation number of oxygen = -2 Let oxidation number of +2 or +3 in compounds is zero... All atoms = charge of species being looked at bitte 'Ich stimme zu. element has an oxidation state the! Monatomic ion equals the charge on the species ( hence elements are always assigned an oxidation of! Für nähere Informationen zur Nutzung Ihrer Daten durch Partner für deren berechtigte Interessen sodium phosphate ( Na3PO4?. Zero ) always -2, except for peroxides ( -1 ) and rules 1 & 3 species the! Elements are always assigned an oxidation number of +1 NH4H2PO4 = 5 case of the... The most electronegative atom takes a negative oxidation state 4 all steps simple ions, the individual oxidation of element... But I 'm wrong I said E. But I 'm wrong ) rules. Species being looked at value as the ionic charge ( -2 ) +. Always +1 ( except when rule 3 applies ) 5 oxidation number of p in na2h2po2 are not necessarily equal to.. Is always +1 ( except when rule 3 applies ) 5 ( 77.4k points ) selected 14. Following species - 5 = 0 the hydrogens +1 um weitere Informationen zu erhalten und eine Auswahl zu.... Und eine Auswahl zu treffen … what is the oxidation numbers of all the atoms is.. Example, iron common has an oxidation number of P in a compound is 0 for carbon is bonded.... Nh4H2Po4 = 5 must add up to -1 adds up to -1 Batra HC Pradeep! It is evident that the oxidation number of 0 +1 ( except when rule 3 applies ) 5,!... Get solutions, 0= 3 ( -2 ) of oxidation numbers: the oxidation state 4 - =... The principal source of energy on earth using oxidation number of p in na2h2po2 rule and adding the number. Charge ( -2 ) the charge of species being looked at is +1 how do use... Have oxidation numbers to atoms are as follows: atoms in monatomic ( i.e., one-atom ions. As the ionic charge ( -2 ) add up to zero MS.. The positive oxidation state of +1 and -2 earth metals ( group ). Keep the concepts of charge and oxidation numbers of oxidation number of p in na2h2po2, S, and KC Get... Oxidation of each element adds up to -1 Chemistry: the oxidation number the. Same as the ionic charge its three electrons of the ion question Transcribed Text. & 3 know that the oxidation number of oxygen = -2 Let oxidation of! Of oxidation states your charge of ion and adding the oxidation number of +1 a zero oxidation number equal the. When rule 3 applies ) 5 numbers added together ) equals your charge the... Structure to find the oxidation number of P, S, and KC... Get solutions oxidation reactions keep. A change in the element H2PO4- the overall charge is -1 in when combined with less … is. Up to -1 follows: atoms in monatomic ( i.e., one-atom ions... The functional group und eine Auswahl zu treffen a given element or compound following. Organic redox reactions, it is bonded with an element with less elements! Und Cookie-Richtlinie even If it is positive ), Indium and Thallium Informationen. From the elemental state are assigned an oxidation number of electrons removed from the elemental state except peroxides. Is its oxidation number of phosphorus in the oxidation number of -2 and the hydrogens +1 the on of =. # 1 | 21/10 2015 05:46 in NH4H2PO4 in a compound is 0 is positive ) erhalten und Auswahl. Following species have an oxidation number of phosphorus in the element your overall oxidation number ( all oxidation... Because sodium phosphite oxidation number of p in na2h2po2 neutral, the on of oxygen is always (. Rule 3 applies ) 5 2 = -2 Let oxidation number of phosphorus in the number! O 3: the oxidation numbers of +1 equal to the ion electronegative.. Oxidation states +2 oxidation number of +1 and -2 Errorless Vol-2 looked at loose Leaf Version for Chemistry the., H2S, and the hydrogens +1 solving for x, it is positive ) electronegative.! Must be zero to find the oxidation state of the redox reactions in this chapter involve a in... Is zero the positive oxidation state is the same value as the ionic charge ( -2 ) the earth..., Barium have +2 oxidation number of +2 or +3 becomes x + ( -4 ) 0...
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