Q. Statement 1:The - and - inner transition series of elements are placed separately at the bottom of the Modem periodic table
Statement 2: (i) Position of -block elements prevents the undue expansion of the Modem periodic table, i.e., maintains its structure
(ii) Position of -block elements preserves the principle of classification by keeping elements with similar properties in a single column

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Solution:

Correct answer is (a) If both Statement and Statement are true and the statement is the correct explanation of the statement