Explain the significance of three Quantum numbers in predicting the positions of an electron in an atom.

1. principle quantum number – n- determines the main shell which contains electron. Determines its distance from nucleus and its energy.

2. angular momentum quantum number – l – determines the sub shell in which electron is present, i.e. s or p or d or f sub shell .

3. magnetic quantum number – m- determines the orbital of electron in that sub shell.