(a) Write the symbols/formulae of two simple ions and two compound ions (or polyatomic ions).(b) An element Y has a valency of 4. Write the formula for its :(i) chloride(ii) oxide(iii) sulphate(iv) carbonate(v) nitrate

(a) Simple ion:
  1. Iodine atom forms an iodide ion by accepting an electron, I-.
  2. Magnesium loses two electrons to form a magnesium ion, Mg2+.
Compound ion:
  1. Carbonate ion, CO32-, is made up of two types of atoms i.e. carbon and oxygen (chemically bonded).
  2. Ammonium ion, NH4+, is made up of two types of atoms i.e. nitrogen and hydrogen (chemically bonded).

(b) Formula for the given compounds are as follows:

(i) On crossing the valencies, chloride for the element Y will have the chemical formula YCl4.
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(ii) On crossing over the valencies, oxide for the element Y will have the chemical formula YO2.
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(iii) On crossing the valencies, sulphate for the element Y will have the chemical formula Y(SO4)2.
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(iv) On crossing the valencies, carbonate for the element Y will have the chemical formula Y(CO3)2.
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(v) On crossing  the valencies, nitrate for the element Y will have the chemical formula Y(NO3)4. 

Updated on: 10-Oct-2022

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