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Srushti
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Row NH4+: NH4NO3, (NH4)2SO4, (NH4)3PO4. Row Li+: LiNO3, Li2SO4, Li3PO4. Row Al3+: Al(NO3)3, Al2(SO4)3, AlPO4. Row Cu2+: Cu(NO3)2, CuSO4, Cu3(PO4)2. Each entry balances the positive and negative charges of the combining ions.

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Virat
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(i) Aluminium nitrate has the chemical formula Al(NO3)3. (ii) Calcium oxide has the chemical formula CaO. (iii) Ferric oxide has the chemical formula Fe2O3. Each formula balances the combining valencies of the constituent ions.

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Virat
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Element X needs two electrons to complete its valence octet. Two X atoms share two electron pairs equally, establishing a double covalent bond to create a stable diatomic molecule with the structure X double bond X.

cbse class 9 science exploration chapter 9 solutionscertain other element y has two electrons in its second shellclass 9 science exploration chapter 9 atomic foundations of matter question answerelement x has six electrons in its outer shell and forms a diatomic moleculewhy would that be so