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Did you know?
One mole contains 6.022 × 10²³ particles — if a mole of seconds passed, it'd be 19 quadrillion years.
Did you know?
One mole contains 6.022 × 10²³ particles — if a mole of seconds passed, it'd be 19 quadrillion years.
Because of lanthanoid contraction, which of the following pairs of elements have nearly the same atomic radii? (Numbers in the parenthesis are atomic numbers.)
and Nb (41)
and Hf (72)
and Ta (73)
and Zr (40)
To solve this problem, we need to understand the concept of lanthanoid contraction.Lanthanoid contraction refers to the gradual decrease in the atomic and ionic radii of the lanthanide series elements from (57) to (71).This contraction occurs due to the poor shielding effect of the 4f electrons.As a result, the elements following the lanthanides in the periodic table, such as
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