Question

What are the values of n and l for the last subshell of Na (Z=11) and B (Z=5)? What are their shapes?

Answer 1

The electronic configuration for Sodium is 1`s^2`2`s^2`2`p^6`3`s^1`

In Sodium the last electron is in 3s subshell, which is spherical in shape.

The electronic configuration for Boron is 1`s^2`2`s^2`2`p^1`

In Boron the last electron is in 2p subshell, which is dumb bell in shape.