### Question Asked by a Student from EXXAMM.com Team

Q 2732823732.

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 preserve the principle of classification by keeping elements with similar properties in a single column.

A Both A and R individually true and R is the correct explanation of A
B Both A and R are individually true but R is not the correct explanation of A
C A is true but R is false
D A is false but R is true

#### HINT

(Provided By a Student and Checked/Corrected by EXXAMM.com Team)

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