atomic structure and isotopes

Atomic (proton) number

The number of protons in the nucleus of an

atom

Electron

A fundamental particle found in the energy

levels of an atom with a relative mass of

1/2000 and a relative charge of -1

Isotope

Atoms of the same element with different

numbers of neutrons

Mass (nucleon) number

The number of particles (protons and

neutrons) in the nucleus

Nucleus

The central part of the atom in which the

nucleons (neutrons and protons) are found

Neutron

A fundamental particle found in the nucleus of

atoms with a relative mass of 1 and a relative

charge of 0

Proton

A fundamental particle found in the nucleus of

atoms with a relative mass of 1 and a relative

charge of +1