Question

(a) What was Mendeleev's basis for classification elements ?
(b) Mendeleev's contributions to the concept of perio
table laid the foundation for the Modern Periodic Table. Give reasons.
​

Answer 1

Answer:

Mendeleev laid the foundation for the modern periodic table by showing periodicity of the properties of the elements by arranging the elements (63) then known into 8 groups, by leaving gaps for undiscovered elements and predicting their properties. He made separate groups for metals and non-metals.

1) Mendeleev's table was based on mass number.

2) He arranged the elements on the basis of their properties in increasing order of their atomic mass.

Answer 2

Answer:

my bro , u may ask kajal , little serious , telling here will not be ok , she may not liek telling to others , she will tell u everything...

Explanation:

how r u my dear buddy? how is ur family? I hope all are ok ...

had lunch? ;)