Question

Question #0137b

Answer 1

Atomic number 15 `1s^2 2s^2 2p^6 3s^2 3p^3`

Explanation:

Phosphorus number 15 is a very unstable element. It has five valance electrons. 10 electrons are in the filled second shell leaving five valance electrons. the `3s^2 3p^3`

Phosphorus can lose electrons giving a charge of +3 and +5.
Phosphorus can also gain electrons achieving a charge of -3

So the electron configuration is

`1s^2 2s^2 2p^6 3s^2 3p^3`