Answer:
(i)
To determine the valency of chlorine atom
Atomic number of chlorine =17
Number of electrons in chlorine atom =17
Distribution of electrons in chlorine atom: K = 2, L = 8,
M = 7
Valency of chlorine atom = 8 ? 7 = 1
(ii) To determine the valency of sulphur atom
Atomic number of sulphur atom =16
Number of electrons in sulphur atom =16
Distribution of electrons in sulphur atom: K = 2,L = 8, M =
6
Valency of sulphur atom = 8 - 6 = 2
(iii) To determine the valency of magnesium atom Atomic
number of magnesium = 12
Number of electrons present in magnesium atom = 12
Distribution of electrons in magnesium atom: K = 2, L = 8,
M = 2
Valency of magnesium atom
is 2 since there are only two electrons in the outermost shell.
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