Question

What is the periodic table based on?

1. The mass of atoms.

2. The charge of atoms.

3. The structure of atoms.

4. The color of atoms.

Answer 1

The periodic table was organised by Russian chemist Dmitri Mendeleev and grouped each element with similar properties and atomic mass. He left gaps in the periodic table for undiscovered elements.

So, 1. The mass of elements is the correct answer