Answer:
The atom with the highest mass with 139 protons and 154 neutrons, is atom 3
Explanation:
The information given are;
The number of protons, p, the number of electrons, e, and the number of neutrons, n, we have;
p, e, n,
39, 39, 52
40, 40 50
139, 39 154
40, 39 51
Based on the information that the mass of the proton = 1.67262 × 10⁻²⁷ kg
The mass of the electron = 1.094 × 10⁻³¹ kg
the mass of the neutron = 1.674927471 × 10⁻²⁷ kg
We have that the atom with the most number of neutron and proton which is atom 3, has the highest mass
we have
