Question

 In Periodic table elements are arranged according to their ___________
 (A) Mass number
 (B) Atomic and Mass number
 (C) Atomic number
 (D) None of the above​

Answer 1

Answer:

Option c.

Atomic number.

Answer 2

Answer:

In Periodic table elements are arranged according to their ___________

 (A) Mass number

 (B) Atomic and Mass number

 (C) Atomic number✔️

 (D) None of the above