Question

Three Salient features of Mendeleev's periodic table

Answer 1

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Salient features of Mendeleev's periodic table are:-
1 Mendeleev classified periodic table into horizontal rows and vertical coloumns. The horizontal rows are called as periods and vertical columns are called groups.

2. The elements with similar properties comes into same group.

3. Mendeleev also left gaps in his periodic table for undiscovered elements like aluminum, silicon and Boron in his periodic table 

Answer 2

Mendeleev's periodic table is arranged based on the increasing order of atomic mass.

• The elements are arranged in a table according to their atomic weight increase, which is Mendeleev's table.

• The elements are organized as rows and columns.

• There are 7 rows which are also known as periods.

• Eight columns or groups are there.

• There are subgroups for each of the groups except the last group.