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@ -37,4 +37,4 @@ tags: [physics]
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### Atomic weight
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* The atomic weight of an atom is its mass.
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* The mass is determined by the number of protons and neutrons in the nucleus.
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* An electron $\frac{1}{1845}$ the mass of a proton. Its mass is so neglible that it makes no marginal difference to the atomic weight and is not included.
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* An electron $\frac{1}{1845}$ the mass of a proton. Its mass is so neglible that it makes no significant difference to the atomic weight.
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