Khan Academy

SOLVED: Three atoms have the following subatomic particles: Atom 1: 12 protons; 6 neutrons, 12 electronsAtom 2: 8 protons, 10 neutrons, 8 electronsAtom 3: protons; 9 neutrons electronsWhich of the following statements are TRUE?They are all the same element; they are isotopes of each other:They all have the same atomic number and atomic massThey are three different elements, but they all have the same atomic mass.They are three different elements and they all have a neutral charge

3.3: Subatomic Particles - Electrons, Protons, and Neutrons

Quarks and leptons are the smallest particles we know. Does something smaller exist?

Subatomic puzzle: Are quarks and leptons hiding another level of matter?