Changes

| style="height:20px; width:200px; text-align:center;" |[[Hydrogen]] always has 1 [[proton]] but in this [[isotope]] there is 1 [[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 [[isotope]] there are 4 [[neutron]]s.

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