Question

An atom has a proton mass of 35, a neutron mass of 35, and an electron mass of 3. What is the estimated mass of the atom?A) 73B) 35C) 38D) 70

Answer 1

We have to remember that the mass of an atom is always estimated by calculating the mass of the atom's core (composed only of neutrons and protons).

Then, we only have to add up the masses of the neutrons and the mass of the protons.

`Mass=\text{ 35 \lparen protons\rparen + 35 neutrons = 70}`

Then, the answer is that the mass is equal to D) 70