Question

Elements are arranged in the periodic table based on their _____. mass number atomic number atomic mass percent abundance

Answer 1

Answer: atomic number

Step-by-step explanation:

Answer 2

The answer to this question would be: atomic number

In the chemistry table, you can find the molecular mass and atomic number. Atomic number represents the number of the protons of an atom, and molecular mass represents the mass of the atom. The mass of an atom is made from proton and neutron. The element is made by arranging it based on the number of protons, which was the atomic number.