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The number of neutrons can vary, depending on the Atomic Mass.

For any given element the number of protons ALWAYS remains the same. The number of neutrons can vary ; this being an isotope.

So you can have lithium six ; Li-6 ' [6/3]Li

or

lithium seven ; Li-7 ; [7/3]Li

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lenpollock

Lvl 17
∙ 2mo ago

What else can I help you with?