Question

How does the modern periodic table arrange elements?

A.
by atomic mass

B.
by atomic number

C.
by number of isotopes

D.
by electron mass

Answer 1

Answer:

b..

Explanation:

but in mendeleve periodic table they were arranged on the basis of atomic mass

Answer 2

Answer:

Explanation:

Modern periodic table arrange with increasing atomic number. So option B is correct.