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: Each [[element]] has many [[isotope]]s but some are [[Stable Isotope|stable]] and others are [[Unstable Isotope|unstable]] so they [[Radioactive Decay|decay]] quickly into other [[isotope]]s or a different [[element]].
: Different [[isotope]]s of the same [[element]] have the same [[Atomic Number|atomic number]] but different [[Relative Atomic Mass|atomic mass]] due to the different numbers of [[neutron]]s.
{| class="wikitable"
| style="height:20px; width:200px; text-align:center;" |'''Hydrogen-1'''
| style="height:20px; width:200px; text-align:center;" |'''Hydrogen-2'''
| style="height:20px; width:200px; text-align:center;" |'''Lithium-7'''
| style="height:20px; width:200px; text-align:center;" |'''Lithium-6'''
|-
|[[File:Hydrogen.png|center|150px]]
|[[File:Deuterium.png|center|150px]]
|[[File:Lithium.png|center|200px]]
|[[File:Lithium6.png|center|200px]]
|-
|[[File:HydrogenSymbol.png|center|200px]]
|[[File:DeuteriumSymbol.png|center|200px]]
|[[File:LithiumSymbol.png|center|200px]]
|[[File:Lithium6Symbol.png|center|200px]]
|-
| style="height:20px; width:200px; text-align:center;" |[[Hydrogen]] always has 1 [[proton]] but in this case has no [[neutron]]s.
| style="height:20px; width:200px; text-align:center;" |[[Hydrogen]] always has 1 [[proton]] but in this case also has a [[neutron]]. This [[isotope]] of [[Hydrogen]] is known as [[Deuterium]].
| style="height:20px; width:200px; text-align:center;" |[[Lithium]] always has 3 [[proton]]s but in this case has 4 [[neutron]]s.
| style="height:20px; width:200px; text-align:center;" |[[Lithium]] always has 3 [[proton]]s but in this case has 3 [[neutron]]s.
|}