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BITSAT 2024

Exam: BITSAT
Year: 2024
Subject: Chemistry
Chapter: Classification of Elements and Periodicity in Properties

BITSAT 2024 · Chemistry · Classification of Elements and Periodicity in Properties

The ionic radii in (Ã…) of N^ 3- , O^ 2- and F^ - are respectively.

The ionic radii in

(Ã…)

of

\mathrm{N}^{3-}, \mathrm{O}^{2-}

and

\mathrm{F}^{-}

are respectively.

Options

A1.71, 1.40 and 1.36
B1.71, 1.36 and 1.40
C $1.36,1.40$ and 1.71
D $1.36,1.71$ and 1.40

Correct answer

A. 1.71, 1.40 and 1.36

Step-by-step solution

\mathrm{N}^{3-}, \mathrm{O}^{2-}

and

\mathrm{F}^{-}

are isoelectronics ( 10 electrons) species. Their ionic radii will decrease with increase in magnitude of the nuclear charge from

\mathrm{N}(\mathrm{Z}=7)

to O

(Z=8)

and

F(Z=9)

. i.e.

\begin{array}{ccc} \mathrm{N}^{3-}> & \mathrm{O}^{2-}>&\mathrm{F}^{-} \\ 1.71 Ã… & 1.40 Ã… & 1.36 Ã… \end{array}

Hence, option (1) is correct.

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