GENERAL KNOWLEDGE

Detailed explanation-1: -Principal quantum number specifies the energy of an electron and the size of the orbital.

Detailed explanation-2: -The principal quantum number, n, describes the energy of an electron and the most probable distance of the electron from the nucleus. In other words, it refers to the size of the orbital and the energy level an electron is placed in. The number of subshells, or l, describes the shape of the orbital.

Detailed explanation-3: -Principal Quantum Number (n) At location n=1, an electron would be closest to the nucleus, while at n=2 the electron would be farther, and at n=3 farther yet. As we will see, the principal quantum number corresponds to the row number for an atom on the periodic table.

Detailed explanation-4: -Each electron in an atom is described by four different quantum numbers. The first three (n, l, ml) specify the particular orbital of interest, and the fourth (ms) specifies how many electrons can occupy that orbital.