Front

What contains most of the mass of an atom?

Back

Nucleus

Front

What is the only difference between two different isotopes of the same element?

Back

Number of neutrons

Front

What is a nuclear reaction where a nucleus splits into two smaller nuclei?

Back

Fission

Front

What is the time needed for half of a radioactive sample to decay called?

Back

Half-life

Front

What particle is found in the nucleus and has a positive charge?

Back

Proton

Front

What is the charge of a neutron?

Back

Neutral (no charge)

Front

What is the smallest unit of an element that retains its properties?

Back

Atom

Front

What are atoms of the same element with different numbers of neutrons called?

Back

Isotopes

Front

What is the process called when two nuclei combine to form a heavier nucleus?

Back

Fusion

Front

What is the term for the central part of an atom?

Back

Nucleus