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==Key Stage 4==
===Meaning===
Calculting the numbers of protons, neutrons, and electrons can be done from information about the [[Relative Atomic Number]], [[Relative Atomic Number]] and [[Relative Atomic Charge]] of a [[particle]].
===About Calculating the Numbers of Protons, Neutrons and Electrons===
: The number of [[proton]]s in an [[atom]] or [[ion]] is given by the [[Atomic Number]].
: The number of [[neutron]]s can be found by subtracting the [[Atomic Number]] from the [[Relative Atomic Mass]].
: The number of [[electron]] in an [[ion]] can be found using the [[Atomic Number]] (which is the same as the [[Relative Atomic Charge]] of the [[Atomic Nucleus|nucleus]]) and subtracting the [[charge]] of the [[ion]].