How can we identify a particular element?

A) by its number of protons
B) by its number of electrons
C) by its number of neutrons
D) by its shape of valence shells
E) by its amount of energy levels

Protons

Positively charged particles found within an atom's nucleus, determining the element's atomic number.

Element

A substance that cannot be changed to a simpler substance by a normal chemical reaction.

Neutrons

Subatomic particles without an electric charge, found in the nucleus of an atom, contributing to the atom's mass.