Q4 of 20 Page 130

List any two properties of the elements belonging to the first group of the Modern Periodic Table.

The properties of elements of first group are


(i) These are highly reactive in nature.


(ii) They have a very low melting point.


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State the basis of classification of elements in the Modern Periodic Table.

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Why are isotopes of an element having different atomic masses placed at the same position in the periodic Table?

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Write two elements for each of the following: i. Alkali metals, ii. Noble gases.