Question

Writ five major differences between mandleev's periodic table and modern periodic table

Answer 1

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The main differences are:

1. Mendeleev's periodic table is based on

atomic mass. Modern periodic table is

based on atomic number.

2. Mendaleev's periodic table contains

about 66 elements. Modern periodic

table contains presently 118 elements.

3. In Mendeleev's periodic table there

were gaps for undiscovered

elements.Modern periodic table

maintains uniformity.

4. In Mendeleev's periodic table noble

gases were not placed (as they are not

discovered at that time).In Modern

periodic table noble gases in a seperate

group named as group-18.

5. In Mendeleev's periodic table transition

elements included with other elements.

In Modern periodic table transition

elements placed in separate block.

6. According to Mendeleev's, the isotopes

with different atomic weights, should be

placed in different positions, but are not

given any position and no justified

reason was explained. In Modern

periodic table, the isotopes were

assigned same position as they have

same atomic number.

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