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  • These ions O2-, F-, Na+, Mg2+, Al3+ are isoelectronic species. Their ionic radii follow the trend:<div class='qn

These ions O2-, F-, Na+, Mg2+, Al3+ are isoelectronic species. Their ionic radii follow the trend:

Option: 1

The ionic radii decrease from O2- to Al3+


Option: 2

The ionic radii increase from O2- to Al3+


Option: 3

The ionic radii increase from O2- to F- and then decrease from Na+, Mg2+, Al3+


Option: 4

The ionic radii decrease from O2- to F- and then increase from Na+, Mg2+, Al3+


Answers (1)

best_answer

Variation of Atomic Radii and ionic radii -

Comparison of the ionic radii and atomic radii

Variation in a Period

In moving from left to right in a period, the nuclear charge increases and the last electron enters into the same shell, thus the effective nuclear charge increases. Thus in this way, the atomic size decreases in the period.

       

 Effective Nuclear Charge

Due to the screening effect of inner or same shell electrons, the net force of attraction between the nucleus and the outer electrons decreases. This decreased force of attraction is known as effective nuclear charge. It is represented by Z*.

II Period

Li

Be

B

C

N

O

F

Ne

Z

3

4

5

6

7

8

9

10

?

1.7

2.05

2.40

2.75

3.10

3.45

3.80

4.15

Z*

1.3

1.95

2.60

3.25

3.90

4.55

5.20

5.85

-

For isoelectronic species, the size of the atom or ion decreases with an increase in nuclear charge. 

Therefore, Option(1) is correct

Posted by

shivangi.shekhar

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