Question

What is the electronic configuration of silicon [Atomic no.=14, Mass number=28]?

• A. $2,8,1$
• B. $2,8,2$
• C. $2,8,3$
• D. $2,8,4$

Answer 1

The correct option is D $2,8,4$

Atomic number of silicon is $14$. K shell can accommodate $2$ electrons and L shell can accommodate $8$ electrons and the remaining $4$ electrons will be accommodated by M shell. Hence the electronic configuration is $2,8,4$.