Question

11. Fill in the blanks.
1. In Dobereiner's triads, the atomic weight of the middle element is
the
of the atomic masses of 1st and 3rd elements.
2. Noble gases belong to
group of the periodic table.
3. The basis of the classifications proposed by Dobereiner, Newlands
and Mendeleev was
4. Example for liquid metal is
III. Match the following.
1. Triads
Newlands
2. Alkali metal
- Calcium
3. Law of octaves
- Henry Moseley
4. Alkaline earth metal
- Sodium5. Modern Periodic Law
Dobereiner​

Answer 1

Answer:

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Answer 2

Answer:

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