Question

the atomic number of aluminum is 13. what is the correct designation of the electron configuration of aluminum? clear all 1s²2s²2p⁶3s²3p¹ 1s²2s²2p⁶2d³ 1s²2s²2p⁶3s³ 1s²1p⁶2s²2p¹

Explanation:

Step1: Recall electron - filling rules

Electrons fill orbitals in the order of increasing energy: 1s < 2s < 2p < 3s < 3p etc. The maximum number of electrons in s - orbital is 2, in p - orbital is 6, in d - orbital is 10 and in f - orbital is 14.

Step2: Determine electron number for aluminum

Aluminum has an atomic number of 13, so it has 13 electrons.

Step3: Write the electron configuration

1s²2s²2p⁶3s²3p¹.

Answer:

1s²2s²2p⁶3s²3p¹