Question

Write the names and symbols of the constituent elements and identify their valencies from the molecular formulae given below.
H2S, Na2S, FeS, BaCl2
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Answer 1

Answer:

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

MgBr2 Magnesium bromide Mg, Br Mg = 2, Br = 1

K2O Potassium oxide K, O K = 1, O = 2

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

CaCl2 Calcium chloride Ca, Cl Ca = 2, Cl = 1

CCl4 Carbon tetrachloride C, Cl C = 4, Cl = 1

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

H2S Hydrogen sulphide H, S H = 1, S = 2

Na2S Sodium sulphide Na, S Na = 1, S = 2

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

BaCl2 Barium chloride Ba, Cl B = 2, Cl = 1

Explanation:

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Answer 2

KCl Potassium chloride K,Cl K=1,Cl=1HBr Hydrogen bromide K,Br K=1,Br=1MgBr 2 Magnesium bromide Mg,Br Mg=2,Br=1K 2