Question

the electron configuration of an atom is $1s^{2}2s^{2}2p^{6}$. the number of electrons in the atom is

Explanation:

Step1: Calculate electrons in each sub - shell

For \(1s^{2}\), number of electrons \(= 2\).
For \(2s^{2}\), number of electrons \(= 2\).
For \(2p^{6}\), number of electrons \(= 6\).

Step2: Sum up the electrons

Total electrons \(=2 + 2+6=10\).

Answer:

10