Question

An atom Q has atomic number = 13.
What will be the electronic configuration of this element ?
• What will be its valency?
• Will it be a metal or a non metal? Give reason for your answer.
Why are inert gases stable ? Explain in terms of their electronic
configuration
•
Complete the following table :
Atomic
Number(Z)
Mass Number No. of
(A)
protons
23
No. of
electrons
No. of
neutrons
14
15
16​

Answer 1

a) electronic configuration- 2,8,3

valency - 3

it will be a metal, as the valency is +3

b) inert gases are stable as there outer most shell is completely filled and valency is zero.

c) I couldn't understand the table

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