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Statement-I : Ca^(2+) and Sc^(3+) are is...

Statement-I : `Ca^(2+)` and `Sc^(3+)` are isolectronic but ionic radius of `Sc^(3+)` is less than that of `Ca^(2+)`.
Statement-II : The effective nuclear charge on the outer shell electrons in `Sc^(3+)` is more than that in `Ca^(2+)`

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(A) : Mg^(2+) and Al^(3+) are isolectronic but the magnitude of ionic radius of Al^(3+) is less than that in Mg^(2+) . (R ) : The effective nuclear charge on the outermost electrons in Al^(3+) is greater than that in Mg^(2+) .

Statement-1: Na^(+) and AI^(3+) are isoelectronic but the magnitude of ionic radius or AI^(3+) is less than that of Na^(+) . Statement-2: The magnitude of effective nuclear charge of the outer most shell electrons in AI^(3+) is greater than that of Na^(+) .

Statement-1: Na^(+) and AI^(3+) are isoelectronic but the magnitude of ionic radius or AI^(3+) is less than that of Na^(+) . Statement-2: The magnitude of effective nuclear charge of the outer most shell electrons in AI^(3+) is greater than that of Na^(+) .

This question has statement I and Statement II. Of the four choices given after the statements, choose the one that best describes the two Statements. (1) Statement-I is true, Statement-II is true, Statement-II is a correct explanation of Statement-I (2) Statement-I is true, Statement-II is true,Statement-II is not a correct explanation of Statement-I (3)Statement-I is a true , Statement-II is false (4) Statement-I is false, Statement-II is true Statement-I: Na^+ and Al^(3+) are isoelectronic but the magnitude of the ionic radius of Al^(3) is less than that of Na^+ Statement-II: The magnitude of the effective nuclear charge on the outer shell electrons in Al^(3+) is greater than that in Na^+

Assertion: Na^(+) and Al^(3+) are isoelectronic but the magnitude of the ionic radius of Al^(3+) is less than that of Na^(+) Reason: The magnitude of effective nuclear charge of the outer shell electrons in Al^(3+) is greater than in Na^(+)

Assertion (A) : Na^+ and Mg^2+ ions are isoelectronic but the ionic radius of Na^+ is greater than the of Mg^2+ . Reason (R) : The effective nuclear charge of Na^+ ion is less than that of Mg ^2+ ion.