The mass of an atom (its atomic mass) depends upon the sum of the number of protons and the number of neutrons present in the nucleus.
The answer is therefore B. 70 (35 protons + 35 neutrons)
Electrons do have SOME mass but it is almost 2000 times less than the mass of a proton. Therefore the electrons mass is insignificant as there aren’t enough electrons to affect the total mass in any stones we know about.
The estimated mass of the atom A. 70. Thus, option "B" is correct.
The mass of the atom is determined by the protons and the neutrons. Since the proton mass is 35 and the neutron mass is 35, all you need to do is add them up together:
35 + 35 = 70 amu
The electron's mass is considered negligible because it is still too small to determine. So the estimated mass of the atom will be based on the neutrons and the protons.
Thus, option "B" is correct.
To learn more about protons click here:
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