Question

How anomalies of mendeleèv's periodic table are removed in modern periodic table?

Answer 1

as elements were arranged in the order of atomic numbers instead of atomic mass these anomalies were removed . for e.g. hydrogen was given first position

Answer 2

● Drawbacks in Mendeleev's periodic table -
- Position of Hydrogen is not explained.
- Metals & non-metals mixed up.
- Isotopes of same element placed at different positions.
- No place for inert gases.

● Improvements in modern periodic table -
- Hydrogen placed above alkali metals.
- Metals & non-metals are separated.
- Isotopes of same element placed at same position.
- Inert gases are placed in separate group. i.e. gr.18.

Hope this helps you...

Answer 3

● Drawbacks in Mendeleev's periodic table -

- Position of Hydrogen is not explained.

- Metals & non-metals mixed up.

- Isotopes of same element placed at different positions.

- No place for inert gases.

● Improvements in modern periodic table -

- Hydrogen placed above alkali metals.

- Metals & non-metals are separated.

- Isotopes of same element placed at same position.

- Inert gases are placed in separate group. i.e. gr.18.

Hope this helps you...