Question

which of the following atoms cannot from ion

a) At.no =20 b) At.no = 18 c) At.no=2. d) At.no= 11​

Answer 1

Answer:

b) At. no 18

Explanation:

a) At. no 20 i.e. Calcium

$\bf{Calcium \: \: can \: \: form \: \: ion \:⇾ \: \red{ Ca ^{2 + }} }$

b) At. no 18 i.e. Argon

Argon being an inert gas, does not form any kind of ions.

c) At. no 2 i.e. Helium

Though Helium is inert gas, it still form ions in extremely high temperature and pressure means in non-STP conditions, as :

$\bf \red{ {He}^{2 + } }$

d) At. no 11 i.e. Sodium

$\bf Sodium \: \: can \: \: form \: \: ion ⇾ \red{Na^{ + } }$