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Question

Given below are two statements :
**Statement (I)** : The 4f and 5f - series of elements are placed separately in the Periodic table top reserve the principle of classification.
**Statement (II)** : s-block elements can be found in pure form in nature.
In the light of the above statements, choose the most appropriate answer from the options given below: A). Statement I is false but Statement II is true B). Both Statement I and Statement II are true C). Statement I is true but Statement II is false D). Both Statement I and Statement II are false

Edvaya · Accepted Answer

The correct answer is Statement I is true but Statement II is false. **Solution:** Statement I is true: The lanthanides (4f) and actinides (5f) are placed at the bottom of the periodic table to maintain its structure and preserve the principle of periodicity. Statement II is false: s-block elements (alkali and alkaline earth metals) are highly reactive due to their very low ionization energies. As a result, they are never found in their pure (free) state in nature; they always exist in a combined state. Therefore, Statement I is true but Statement II is false.

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Chemistry > Inorganic Chemistry > Classification Of Elements And Periodicity

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