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masterfy24
It should be, 1s^2, 2s^2, 2p^6, 3s^2, 3p^3. You could also shorten this and say and say {Ne} 3s^2, 3p^3.

Answer: [tex]P:1s^22s^22p^63s^23p^3[/tex]

Explanation: An element with atomic number 15 means the element has 15 electrons and 15 protons. The given element is Phosphorous and the chemical symbol is P. According to Afbau's rule , the electrons are filed in order of increasing energies as given below:-

[tex]P:1s^22s^22p^63s^23p^3[/tex]

The nearest noble gas is Neon(Ne) with 10 electrons. Thus in noble gas configuration it can also be written as:

[tex]P:[Ne]3s^23p^3[/tex]



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