The table below gives the numbers of protons, electrons, and neutrons in four atoms. atom number of protons number of electrons number of neutrons 1 39 39 52 2 40 40 50 3 39 39 54 4 40 40 51 based on the information that is given, which atom in the table has the highest mass? 1 2 3 4

Answer : Atom 3 in the table has the highest mass.

Explanation : Given table,

       Atoms                          1               2           3            4

Number of protons            39            40          39         40

Number of electrons         39            40           39        40

Number of neutrons          52            50          54         51

Atomic mass is calculated by the addition of Number of protons and Number of neutrons are present in an element.

Atomic mass = Number of protons + Number of neutrons

The Atomic mass of Atom 1 = 39 + 52 = 91

The Atomic mass of Atom 2 = 40 + 50 = 90

The Atomic mass of Atom 3 = 39 + 54 = 93

The Atomic mass of Atom 4 = 40 + 51 = 91

Therefore,  Atom 3 has the highest atomic mass.

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