Question

answer it please with step​

Answer 1

Tip:

• Z (Atomic number) = No. of electrons
• Electrons in a shell = 2n²; n = energy level index.

Answer:

1. Element A:

e- in:

• K shell = 2(1)² = 2
• L shell = 2(2)² = 8
• M shell = 1

So, electronic config : 2, 8, 1.

Element B:

No. of electrons = 5

e- in:

• K shell = 2(1)² = 2
• L shell = 3

So e. config : 2, 3.

Element C:

No. of electrons = 17

e- in:

• K shell = 2(1)² = 2
• L shell = 2(2)² = 8
• M shell = 7

So, e. config : 2, 8, 7.

Element D:

No. of electrons = 1

e- in: K shell = 1.

Electronic config : 1

2. METALS: (Lose e- to complete octet.)

• A
• B

NON METALS: (Gain e- to complete octet or duplet.)

• C
• D.

N.B.: There are no elements which are inert. As there is no following of octet or duplet rule.