Question

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Al3+, F, Cl-, O2-, Na, Mg2+
Arrange the isoelectronic species in the decreasing order of their size

Answer 1

Answer:

the answer is 4>3>2>5>6>1

Explanation:

its because  due to fajan"s rule.

now fajan" rule states that

1] in an iso-electronic species the anion [which is the negative ion] is larger than the parent ion due to interelectronic repulsions due to additiion of an electron.

2] the cation [ the positively charged ion is smaller than its parents ion due to high nuclear charge due to its ionisation.