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7. What does the mass for each element on the periodic table represent:
a. A more accurate mass measurement including more significant figures
b. The regular average mass of all of the ions of that element
C. The weighted average mass of all of the isotopes of that element
d. Those masses include electrons into the mass calculation
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Answer:

A

Explanation:

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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