Transition elements are also known as ____________.
A
d - block elements
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B
f - block elements
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C
s - block elements
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D
None of these
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Solution
The correct option is Ad - block elements The transition elements are also known as the d-block elements because while the outermost level contains at most two electrons, their next to outermost main levels have incompletely filled d sub-orbitals, which are filled-up progressively ongoing across the periodic table from 8 to 18 electrons. The filling of the d sub-orbitals of the transition elements across a row of the periodic table is not always regular.