The table below gives the numbers of protons, electrons, and neutrons in four atoms. Atom
11
2
Number of protons
39
40
|39
40
Number of electrons
39
40
39
40
Number of neutrons
52
50
154
51
3
14
Based on the information that is given, which atom in the table has the highest mass?
O 1
2
3

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

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