Question

what element has the electron configuration $1s^{2}2s^{2}2p^{6}$
magnassium
carbon
nitrogen
oxygen

Explanation:

Step1: Calculate the total number of electrons

The sum of the exponents in the electron configuration gives the total number of electrons. For \(1s^{2}2s^{2}2p^{4}\), we have \(2 + 2+4=8\) electrons.

Step2: Determine the element based on atomic number

The number of electrons in a neutral atom is equal to its atomic number. An element with atomic number \(8\) is oxygen.

Answer:

D. Oxygen