Question

In addition to having identified more elements, the modern periodic table also gives the atomic masses more digits. Why do you think this the case?

Answer 1

It is because of the mass number of different isotopes being added together and the average would be the atomic mass.

Explanation:

Isotopes are atoms of the same element with different neutron number and the modern periodic table calculate the average of all the mass numbers of the same element according to the percentage of which the isotope is found on earth