What is the maximum number of electrons that can occupy the first shel

What is the maximum number of electrons that can occupy the first shell of an atom ?

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UPSC NDA-2 – 2024

The maximum number of electrons that can occupy the first electron shell of an atom is 2.

– Electron shells (also called energy levels) surround the nucleus of an atom. They are denoted by the principal quantum number, n (n=1, 2, 3, …), where n=1 is the shell closest to the nucleus.
– The maximum number of electrons that can occupy a given shell is determined by the formula 2n², where n is the shell number.
– For the first shell (n=1), the maximum number of electrons is 2 * (1)² = 2 * 1 = 2.
– For the second shell (n=2), the maximum number of electrons is 2 * (2)² = 2 * 4 = 8.
– For the third shell (n=3), the maximum number of electrons is 2 * (3)² = 2 * 9 = 18, and so on.

The first shell (n=1) contains only one subshell, the ‘s’ subshell, which can hold a maximum of 2 electrons. The electron configuration follows the Aufbau principle, Hund’s rule, and the Pauli exclusion principle, filling lower energy levels before higher ones.

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