There are _ periods and _ groups respectively in the modern periodic table.

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Answer the following:

1. How could the modern periodic table remove various anomalies of Mendeleev’s periodic table?

2. In the modern periodic table, which are the metals, non-metals and metalloids among the first twenty elements?

3. What are the demerits of Mendeleev’s periodic table?

4. Define atomic size. How does it vary in a period and in a group?

(a) State the modern periodic law.

(b) How many periods and groups are there in the modern periodic table?

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