atomic mass number of an atom is the total number of ______
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atomic mass number of an atom is the total number of ______
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Answer:
The mass number (represented by the letter A) is defined as the total number of protons and neutrons in an atom. Consider the table below, which shows data from the first six elements of the periodic table. Consider the element helium. Its atomic number is 2, so it has two protons in its nucleus.