Question

Why does a transition series contain ten elements ?

Answer 1

Answer:

In transition elements electrons enter the d orbital, which can hold a maximum of 10 electrons, hence only 10 elements in each row.

Answer 2

Explanation:

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 on going across the periodic table from 8 to 18 electrons(d orbital can hold

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