If an atom has 17 protons, 18 neutrons, and 17 electrons, what is the mass of this atom?
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35

Explanation:

To get the mass number, you add the number of Protons, with the number of Neutrons!

17 + 18 is 35

b is the correct

because u need two or more forms of the same element that contain equal numbers of protons but different numbers of neutrons in their nuclei to form isotopes.

so since they all have the same shape? i mean maybe because m& m and reeses are both chocolates