Atoms of the transition element are smaller than those of the s-block elements. This is because of :

usual contraction in size across a horizontal period

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orbital electrons are added to the penultimate d-shell rather than to the outermost shell of the atom

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both A and B

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none of the above

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Solution

The correct option is C both A and B
Atoms of the transition element are smaller than those of the s-block elements due to contraction in size in periods and also new elctrons are added to the penultimate d-shell rather than to the outermost shell of the atom.

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Atoms of the transition element are smaller than those of the s-block elements. This is because of :

The correct option is C both A and BAtoms of the transition element are smaller than those of the s-block elements due to contraction in size in periods and also new elctrons are added to the penultimate d-shell rather than to the outermost shell of the atom.

The correct option is C both A and B
Atoms of the transition element are smaller than those of the s-block elements due to contraction in size in periods and also new elctrons are added to the penultimate d-shell rather than to the outermost shell of the atom.