How many electrons can be accommodated in 1^st shell?

Only 2 electrons can be accommodated in the first shell.

Electrons revolve in stationary shells around the nucleus called orbits. These shells are represented by K, L, M, and N. 

• The first shell is called the K shell. It can hold a maximum of up to 2 electrons. 
• The L shell accommodates 8 electrons.
• The M shell can have 18 electrons. 
• The N shell can accommodate 32 electrons.