Front

Smallest particle of an element with its properties

Back

atom

Front

Protons in an atom's nucleus

Back

atomic number

Front

Particles around the atom's center with a -1 charge

Back

electron

Front

Area around an atom's nucleus where electrons are likely found

Back

electron cloud

Front

Vertical column in the periodic table

Back

Group

Front

Atoms of the same element with different masses due to varying neutrons.

Back

isotope

Front

Sum of protons & neutrons in an atom's nucleus

Back

mass number

Front

Neutral particle made of quarks in an atom's nucleus

Back

neutron

Front

Horizontal row in the periodic table

Back

Period

Front

Organized list of known elements by increasing atomic number

Back

Periodic table