when it reacts with hydrogen.
Find the valency of element M.
(b)Write the valency of chlorine and sulphur.
(c)Name three isotopes of hydrogen.
(a)Valency of M=3 because it combines with three atoms of
hydrogen.
(b)Valency of chlorine (Cl 2, 8, 7) = 8- 7 =1
Valency of sulphur (S 2, 8, 6) =8 -6 =2
(c) Protium
, Decuterium
,Tritium 
.
Answer:
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