In the electronic configuration of an atom. What does ‘n’ signify in the formula 2n²?

The number of the given shell from the nucleus

The correct answer is option 3. The number of the given shell from the nucleus.

In the electronic configuration of an atom, the symbol 'n' typically represents the principal quantum number, which indicates the energy level or shell occupied by the electrons. So, in the formula \(2n^2\), 'n' signifies the number of the given shell from the nucleus. Therefore, the correct answer is 3. The number of the given shell from the nucleus.