Question

Chlorine has two isotopes, viz, Cl-35 & Cl-37. There atomic masses are 35 & 37 respectively. There chemical properties are same. Where should these be placed in Mendeleev's periodic table? In different places or in the same place?

Answer 1

these should be placed in different position in Mandeleev periodic table but it was a limitation of his periodic table that the position of isotopes was not described in Mandeleev periodic table.

hope it will help

Answer 2

May be in different place.