Question

write the electron configuration for a neutral atom of aluminum.

Explanation:

Step1: Determine atomic number

Aluminum has atomic number 13.

Step2: Fill electron - shells

Start filling shells using Aufbau principle. 2 electrons in 1s, 2 in 2s, 6 in 2p, 2 in 3s and 1 in 3p.

Answer:

$1s^{2}2s^{2}2p^{6}3s^{2}3p^{1}$