Which of the following order of atomic/ionic radius is not correct?

Question

Which of the following order of atomic/ionic radius is not correct?

Which of the following order of atomic/ionic radius is not correct?
A. `F lt CI lt Br lt I`
B. `Y^(3+) gt Sr^(2+) gt Rb^(+)`
C. `Nb ~~ Ta`
D. `Li gt Be gt B`

Monjur Alahi

4 views

2025-01-04 04:42

1 Answers

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Salim Ahmed Kawsar · Accepted Answer · 2023-02-05T15:29:48+06:00

Correct Answer - B
Atomic radius increases on moving top to bottom in a group due to increasing number of shells. However, it decreasing on moving left to right in a period due to increasing `Z_(eff)` and addition of electrons to the same shell.
`Nb (4d) ~~ Ta (5d)` (due to poor shielding of nucleus charge by `4f` electrons).
For isoelectronic species, ionic radius `prop (1)/("nucleus charge")`. So correct order is `Y^(3+) lt Sr^(2+) lt Rb`.