What is the electron configuration of an element with atomic number 15?

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:-

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

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periodic trends is an atom that gets larger as the number of electronic shells increase, the radius of atoms increases as you go down a certain group in the periodic table of elements. in general, the size of an atom will decrease as you move from left to right of a certain period.