Question

Which has greater bond length among the Na+, Mg**and Al+++ ?

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Answer 1

Na⁺ has a greater bond length than Mg²⁺ and Al³⁺.

• The given species, Na⁺, Mg²⁺, and Al³⁺ have the same number of electrons, i.e. they are isoelectronic in nature.
• The effective nuclear charge increases on moving across the period, and it is inversely proportional to the atomic radius or (atomic size)
• Hence, the order of increasing bond length is Al³⁺ < Mg₂⁺ < Na⁺