Question

give reason for
the properties of elements are periodic functions of their atomic no. and not atomic weight​

Answer 1

Answer:

Explanation:

Atomic number of an element is equal to the number of protons (or electrons in case of a neutral atom). Physical and chemical properties of elements depend on the number of electrons and their arrangement. Thus, properties of elements are periodic function of their atomic numbers and not atomic weights.,If atomic weight or mass is used to arrange the elements in the periodic ta

ble then the isotopes having the different mass need to be placed in a separate position.

Isotopes have similar properties and should be placed together.  This is a major drawback of  Mendeleev's table.  Isotopes have the same atomic number and using atomic number as the criteria for arranging the elements puts isotopes in the same place in the table. This is a better way for arranging the elements in the periodic table and was adopted as the basis of the periodic law.