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Q.

There are two rows of inner transition elements in the periodic table each containing 14 elements. The reason for this may be

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a

28 is the maximum number of elements that any block can accommodate

b

f-orbital has seven values for magnetic quantum number, hence total electrons are 14

c

in the periodic table there is space to accommodate 14 electrons only

d

only 28 inner transition elements have been discovered till date

answer is A.

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Detailed Solution

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For an f-orbital, l=3, m=-3,-2,-1,0,1,2,3(7 values).

Total no. of orbitals=7

Total no. of electrons=14.

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