Question

Which of the following is basis of the modern periodic table ?
A. Atomic mass B. Atomic number C. Atomic size D. Atomic volume

Answer 1

Answer:

atomic mass

Explanation:

Answer 2

Answer:

atomic number because when the periodic table is

prepared on the basis of atomic mass the position of

lanthanides and actinides cannot be justified as well as

position of isotopes also so it is prepared on the basis of

atomic number