Front

Substance that can't be broken down chemically or physically?

Back

element

Front

Smallest particle of an element that retains its characteristics?

Back

atom

Front

Subatomic particle with a positive charge?

Back

proton

Front

Subatomic particle with a negative charge?

Back

Electron

Front

Subatomic particle in nucleus with no charge?

Back

Neutron

Front

Number of protons in an atom's nucleus?

Back

atomic number

Front

Region around an atom's nucleus where electrons are found.

Back

energy level

Front

Atoms of the same element with the same protons but different neutrons are called?

Back

Isotope

Front

Number of protons + neutrons in an atom's nucleus?

Back

mass number

Front

Substance of 2+ elements chemically combined in specific proportions?

Back

Compound