9th Class
Science
Structure of the Atom
Question Bank
9th CBSE Science Structure of the Atom
question_answer
An element 'M' forms the compound 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 .