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Atom
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| 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. This particular [[isotope]] of [[Lithium]] is [[Unstable Isotope|unstable]] and will [[Radioactive Decay|radioactively decay]].
|}
===History of Atoms===
: The existence and structure of [[atom]]s was not always known.