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He atomic mass of an element is equal to ________. its mass number its atomic number one-twelfth of the mass of a carbon-12 atom the mass of an "average atom" the mass of the heaviest isotope
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He atomic mass of an element is equal to ________. its mass number its atomic number one-twelfth of the mass of a carbon-12 atom the mass of an "average atom" the mass of the heaviest isotope

User Jnovo
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Its atomic number! The mass number is the number that is much smaller than the atomic number and usually under the formula.

User AMAN SINGH
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