Quantum Number: This is like the address for an electron in an atom. It defines the main energy level (floor), shape (apartment type) and orientation (room number).
Orbital: This is a region within an atom where there's a high probability to find an electron. It's like individual rooms in our apartment analogy.
Valence Electrons:These are electrons that occupy the outermost shell or principal quantum level of atoms. They're like people living on the top floor who have easy access to leave the building (react with other atoms).