Atoms are indivisible building blocks that make up matter.

I bombarded the chamber of gold foil with alpha particles.

_______ spectrum.

I, James _____, discovered the neutron.

The _____’s equation ignited the field of quantum mechanics.

Electrons fill up the lowest available energy levels first by the _____ Principle.

_____ Exclusion Principle states that one orbital can hold up to 2 electrons with opposite spins.

____’s Rule states that electrons fill orbitals singly before occupying them as pairs.

Vertical = V

Horizontal = H

Diagonal = D