Question

Why do transition metals have similar atomic radii?

Answer 1

This will decrease the radius of anatom. At the same time, in transition elements the number of electrons in the 3d sub-shell will increase. ... Effective nuclear charge increases across a period because the nuclear charge increases but the shielding stays roughly the same (at least until you get to transition metals).

Answer 2

ANSWER

Across the period, the number of shielding shells remains the same, but positive charge of nucleus increase, leading to a stronger force of attraction between the nucleus and the valence electrons, resulting in a smaller atomic radius.

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