The table compares some characteristics of two atoms.

charged particles
atom number of neutrons mass number
x 4 7
y 5 9

use the table to determine the number of protons for each atom. then, choose the statement below that is true about the two atoms.

1. atoms x and atom y are in the same family.
2. atom x is in a column to the right of atom y on the periodic table.
3. atom x and atom y are in the same row on the periodic table.
4. atoms x and atom y are isotopes.

Explanation:

Atom X,

Neutron num = 4, Mass num = 7

Therefore, proton number = Mass num - Neutron num

                                           = 7 - 4

                                           = 3

Atom Y,

Neutron num = 5, Mass num = 9

Therefore, proton number = Mass num - Neutron num

                                           = 9 - 5

                                           = 4

1) False. Atom X belongs to group 3 while atom Y belongs to group 4

2) False. Atom X is in a column on the left of Atom Y

3) True. Atom X and atom Y belong to the same period two on the periodic table

4) Fasle. Atom X and Y are not isotopes because they do not have the same atomic number.

Isotopy is a phenomenon whereby atom of same element have same atomic number but different mass number