Question

Match the following columns.

Column $\mathrm{I}$ (Noble gases)

Column $\mathrm{II}$ (Electronic configuration)

Column 1	Column 2
Helium	$2,8$
Neon	$2,8,8$
Krypton	$2$
Argon	2,8,8,18

Answer 1

A. Helium : $\left(\mathrm{III}\right)2$

Helium has the atomic number $2$. so the configuration will be: $\mathrm{He}\to 2$

B. Neon: $\left(\mathrm{I}\right)2,8$

Neon has the atomic number $10$. so the configuration will be: $\mathrm{Ne}\to 2,8$

C. Krypton: $\left(\mathrm{IV}\right)2,8,8,18$

Krypton has the atomic number $36$. so the configuration will be: $\mathrm{Kr}\to 2,8,8,18$

D. Argon: $\left(\mathrm{II}\right)2,8,8$

Argon has the atomic number $18$. so the configuration will be: $\mathrm{Ar}\to 2,8,8$

So,

A. Helium	$\left(\mathrm{III}\right)2$
B. Neon	$\left(\mathrm{I}\right)2,8$
C. Krypton	$\left(\mathrm{IV}\right)2,8,8,18$
D. Argon	$\left(\mathrm{II}\right)2,8,8$