Write the names and symbols of the constituent elements and identify their valencies from the molecular formulae given below.

$KCl, HBr, {MgBr}_{2}, K_{2} O$ .

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Solution

Compounds Name of compounds Symbol of constituent elements Valency of constituent elements

KCl Potassium chloride K, Cl K = 1, Cl = 1

HBr Hydrogen bromide K, Br K = 1, Br = 1

${MgBr}_{2}$ Magnesium bromide Mg, Br Mg = 2, Br = 1

$K_{2} O$ Potassium oxide K, O K = 1, O = 2

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The chemical formulae of different compounds can be written easily if the symbols and the valencies of the elements are known.

KCl, HBr, {MgBr}_{2}, K_{2} O, NaH

K C l, H B r, M g {B r}_{2}, K_{2} O, N a H, C a {C l}_{2}, C {C l}_{4}, H I, H_{2} S, {N a}_{2} S, F e S, B a {C l}_{2}

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Compounds	Name of compounds	Symbol of constituent elements	Valency of constituent elements
KCl	Potassium chloride	K, Cl	K = 1, Cl = 1
HBr	Hydrogen bromide	K, Br	K = 1, Br = 1
${MgBr}_{2}$	Magnesium bromide	Mg, Br	Mg = 2, Br = 1
$K_{2} O$	Potassium oxide	K, O	K = 1, O = 2