Question

Compare and contrast the arrangement of elements in mendeleev's periodic table and the Morden periodic table

Answer 1

Answer:

Explanation:

1. Mendeleev's Periodic table:

(i) Elements are arranged in the increasing order of their atomic mass.

(ii) This table has 8 groups and 6 periods. And each group is subdivided as a A and B.

(iii) In this table Hydrogen has no position.

(iv) No position for isotopes, because in Mendeleev period these are not discovered.

2. Modern Periodic table:

(i) Elements are arranged in the increasing order of their atomic number.

(ii) It has 18 groups and 7 periods.

(iii) Inert gases are placed in separate group.

(iv) In this table a zigzag line separates Metals from Non-metals.