Write the names and symbols of the constituent eleements and identify their valencies from the molecular formulae given below.
KCl, HBr, MgBr₂, K₂O, NaH, CaCl_2, CCl₄, HI, H₂S, Na₂S, FeS, BaCl₂

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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

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

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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}

H_{2} O

C {C l}_{4}

H_{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
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