Choose the element described by the following electron configuration.

1s22s22p63s23p6

argon

krypton

chlorine

sulfur

Argon.

Explanation:

It has atomic number of 18 and has a stable 8 electron outer shell.

Argon.

The answer to your question is Argon

Explanation:

Electron configuration given 1s² 2s² 2p⁶ 3s² 3p⁶

To find the element whose electron configuration is given, we can do it by two methods.

Number 1. Sum all the exponents the result will give you the atomic number of the element.

2 + 2 + 6 + 2 + 6 = 18

The element with an atomic number of 18 is Argon.

Number 2. Look at the last terms of the electronic configuration

3s² 3p⁶

Number three indicates that this element is in the third period in the periodic table.

Sum the exponents 2 + 6 = 8

Number 8 indicates that this element is the number 8 of that period without considering the transition elements.

The element with these characteristics is Argon.