Question

5. Write the names and symbols of the
constituent elements and identify their
valencies from the molecular formulae
given below.
KCI, HBr, MgBr,, K,O, NaH, CaCl,, CCI,
HI, H,S, Na, S, FeS, BàCi,​

Answer 1

Explanation:

Compounds Name of compounds Symbol of constituent element 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

NaH Sodium hydride Na,H Na=1,H=1

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$$

FeS Iron(II) Sulfide Fe,S F=2,S=2

BaCl

2

Barium chloride Ba,Cl B=2,Cl=1