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What is the electron configuration for a nitride ion ?

Answer
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Hint: To solve the given question, the concepts to be cleared are about Quantum number, shells, sub-shells, orbitals, Pauli Exclusion Principle, Aufbau Rule and P fund's Rule.
Quantum number is basically the address of an electron in an atom.Shells are the permitted orbits where an electron revolves with fixed angular momentum. Subshell is a division under shell which contains orbital or orbitals.

Complete step by step solution:
The formula for nitride ion is N3 . Here, the total number of electrons in the ion is 10 .
The four quantum numbers are Principal Quantum Number which denotes the shell, Azimuthal Quantum Number denoting sub-shell, Magnetic Quantum Number and Spin Magnetic Number.
The sub-shells are s,p,d,f, . . . . . . and so on. They are filled on the basis of energy with n+l rule.
So, N3 can be represented as 1s22s22p6 .

Additional Information:
Pauli’s Exclusion Principle states that any 2 electron can never have all the same 4 quantum numbers.
Aufbau Rule explains the filling of electrons according to energy level.
P fund’s Rule explains that every orbital with one electron then fills another electron.
The magnetic quantum number differentiates orbitals in a given subshell. The l is always less than shell when l=0;s,l=1;p,l=2;d,l=3;f and so on.
2 Electrons are present in s, 6 in p, 10 in d and 14 in f.

Note:
During the electronic configuration, always make sure to write with inner to outer shells but fill the electron according to energy. The energy of 3d is more than 4s but 3d is written inner to 4s .