(Ex.Q.5)
Write the names and symbols of the constituent elements and identify their valencies from the molecular formulae given below.

${CaCl}_{2}, {CCl}_{4}, HI, H_{2} S, {Na}_{2} S,$

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Solution

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

${CaCl}_{2}$ Calcium chloride Ca, Cl Ca = 2, Cl = 1

${CCl}_{4}$ Carbon tetrachloride C, Cl C = 4, Cl = 1

$HI$ Hydrogen iodide H, I H = 1, I = 1

$H_{2} S$ Hydrogen sulphide H, S H = 1, S = 2

${Na}_{2} S$ Sodium sulphide Na, S Na = 1, S = 2

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Compounds	Name of compounds	Symbol of constituent elements	Valency of constituent elements
${CaCl}_{2}$	Calcium chloride	Ca, Cl	Ca = 2, Cl = 1
${CCl}_{4}$	Carbon tetrachloride	C, Cl	C = 4, Cl = 1
$HI$	Hydrogen iodide	H, I	H = 1, I = 1
$H_{2} S$	Hydrogen sulphide	H, S	H = 1, S = 2
${Na}_{2} S$	Sodium sulphide	Na, S	Na = 1, S = 2