Question

the electron configuration of an element is: 1s² 2s² 2p⁶ 3s² 3p⁵. the element is silicon silver nitrogen chlorine

Explanation:

Step1: Calculate total electrons

Add up the exponents in the electron - configuration. $2 + 2+6 + 2+5=17$.

Step2: Identify element

The atomic number of an element is equal to the number of electrons in a neutral atom. Chlorine has an atomic number of 17.

Answer:

D. chlorine