Question:

Which of the following is NOT a true about atomic mass?

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Hi, I can't figure out the answer to this question.

A The atomic mass is 12 g for magnesium.

B The atomic mass is the mass of one mole of atoms.

C The atomic mass is found by checking the periodic table.

D The atomic mass is the number of grams of an element that is numerically equal to the mass in amu.

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  1. Answer is A.

    12 is atomic number, which having 12 electrons in 1 magnesium atom.


  2. Magnesium has an atomic NUMBER of 12 and an atomic mass of 24.305g.
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