Front

Arrangement of elements organized by atomic number

Back

Periodic Table

Front

Subatomic particles found on the outermost shell & responsible for the atom's reactivity

Back

Valence electrons

Front

Subatomic particles with a negative charge

Back

Electrons

Front

Discovered the neutron within the atom

Back

Chadwick

Front

Discovered the electron within the atom

Back

Thomson

Front

The center of an atom, containing protons and neutrons

Back

Nucleus

Front

Positively charged subatomic particles found in the nucleus

Back

Protons

Front

Neutral subatomic particles found in the nucleus

Back

Neutrons

Front

The number of protons in the nucleus of an atom, defining the element

Back

Atomic number

Front

The total number of protons and neutrons in an atom's nucleus

Back

Atomic mass