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What is relative atomic mass of an element and why is it a decimal?

What is relative atomic mass of an element and why is it a decimal?
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What is relative atomic mass of an element and why is it a decimal?

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User Fragmentedreality
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The atomic mass is an average of the sum of protons and neutrons in an atom. For example, chlorine always has 17 protons but it's atomic mass is 35.45. That means it usually has 18 or 19 neutrons.
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User Andy TAR Sols
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