Question #0137b

1 Answer
David Drayer
May 9, 2017

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

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