the nubmer of mass is equal
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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
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Explanation:
Together, the number of protons and the number of neutrons determine an element's mass number: mass number = protons + neutrons.
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