Which element has the electron configuration of argon (Ar) when it has a stable electron configuration?

Question

(1 point)
Responses

bromine (Br)
bromine (Br)

magnesium (Mg)
magnesium (Mg)

oxygen (O)
oxygen (O)

potassium (K)

Answer 1

The element that has the electron configuration of argon (Ar) when it has a stable electron configuration is bromine (Br).

Bromine has the atomic number 35, and in its stable form (Br⁻), it gains an electron to achieve the same electron configuration as argon (Ar), which has 18 electrons. So, the correct answer is:

bromine (Br)