Question

what atom matches this electron configuration? 1s22s22p63s2 neon potassium aluminium magnesium 9/10 skip

Explanation:

Step1: Count electrons in configuration

The electron - configuration $1s^{2}2s^{2}2p^{6}3s^{2}$ has a total of $2 + 2+6 + 2=12$ electrons.

Step2: Match with atomic number

The atomic number of an element is equal to the number of electrons in a neutral atom. Magnesium (Mg) has an atomic number of 12.

Answer:

Magnesium