Atomic number of a few elements are given below 10, 20, 7, 14
(a) Identify the Group number of the element with atomic number 14.
(b) Identify the Periods of these elements in the Periodic Table.
(c) What would be the electronic configuration for element with atomic number 20?
(d) Determine the valency of the element with atomic number 7.

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Solution

a) Silicon belongs to group 14.

b) Nitrogen and Neon belong to period 2. Calcium and silicon belongs to Period 3.

c) Electronic Configurations:
Calcium-2,8,8,2

d) Valency:
Nitogen-3

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