Question

Assertion :Among isoelectronic species, the cation with the greater positive charge will have a smaller radius. Reason: Greater the attraction of the electrons to the nucleus, smaller is the size of atom/ion.

• A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
• B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
• C. Assertion is correct but Reason is incorrect
• D. Both Assertion and Reason are incorrect

Answer 1

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

The ions having same number of electrons are called isoelectronic species.

In such ions, size decreases as the nuclear charge (atomic number) of the ion increases. In case of multivalent cations, more is the magnitude of charge smaller is the ion. This is due to the enhanced effective nuclear charge, the outer electrons experience greater attraction towards the nucleus and thus have smaller size.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion