Question

the element that corresponds to the electron configuration 1s²2s²2p⁶ is a. sodium b. magnesium c. lithium d. neon

Explanation:

The sum of electrons in the given electron - configuration $1s^{2}2s^{2}2p^{6}$ is $2 + 2+6=10$. The atomic number of an element is equal to the number of electrons in a neutral atom. Neon has an atomic number of 10.

Answer:

D. neon