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Assertion :The 4f- and 5f- inner transition series of elements are placed separately at the bottom of the periodic table. Reason: (i) This prevents the undue expansion of the periodic table i.e., maintains its structure.
(ii) This preserves the principle of classification by keeping elements with similar properties in a single column.
Assertion :The 4f- and 5f- inner transition series of elements are placed separately at the bottom of the periodic table. Reason: (i) This prevents the undue expansion of the periodic table i.e., maintains its structure.
(ii) This preserves the principle of classification by keeping elements with similar properties in a single column.
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Solution
The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
4f and 5f - inner transition series of elements are placed separately at the bottom of the periodic table. It is because 1) It prevents the undue expansion of the periodic table i.e. maintains it's structure.2) This preserves the principle of classification by keeping elements with similar properties in a single column.
4f and 5f - inner transition series of elements are placed separately at the bottom of the periodic table. It is because
1) It prevents the undue expansion of the periodic table i.e. maintains it's structure.
2) This preserves the principle of classification by keeping elements with similar properties in a single column.
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