CAIE IGCSE Chemistry 2.2.2 Relative charges & relative masses

Practise recalling relative charge and mass for protons, neutrons and electrons, then applying them in atomic tables.

Exam points

complete tables for proton, neutron and electron relative charges and masses
explain zero overall charge by matching the number of protons and electrons
link each particle to its position in the atom when tables include nucleus or shells

[Maximum number: 1]

${ }_{11}^{22} \mathrm{Na},{ }_{11}^{23} \mathrm{Na}$ and ${ }_{11}^{24} \mathrm{Na}$ are isotopes of sodium.

Why do all three isotopes have an overall charge of zero?

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