Atoms & Isotopes (AQA GCSE Physics): Flashcards

Number of protons

Same number of protons

Equal numbers

Number of protons plus neutrons

Atoms of same element with different numbers of neutrons

Same atomic number

Mass numbers

$\text{neutrons} = \text{mass number} - \text{atomic number}$

Atoms losing or gaining electrons

Atom that lost or gained electrons

Positive

Negative

Number of electrons