Question

what element has the configuration 1s²2s²2p⁶3s²3p⁶

Explanation:

Step1: Calculate the total number of electrons

The sum of the exponents in the electron configuration gives the total number of electrons.
$$2 + 2+6 + 2+6=18$$

Step2: Relate the number of electrons to the atomic number

In a neutral atom, the number of electrons is equal to the atomic number. So the atomic number \(Z = 18\).

Answer:

The element with atomic number \(18\) is Argon (\(Ar\)).