Question

the atom of an element has 2 electrons in the m-shell.what will be atomic number of the element ?name the element

Answer 1

magnesium cause go by aufbau principal you have to go 1s2 (k) 2s2 2p6 (l) 3s2 (m )

Answer 2

The atomic number is 17 and the element is chlorine.

Thanks if like.