Question

Which metal are called class 'a' elements or 'hard acid' and why?

Answer 1

Answer on Question #76562 – Chemistry – Inorganic Chemistry

Which metal are called class 'a' elements or 'hard acid' and why?

Solution:

Class 'A' elements are metals that form hard acids. Metal ions with the highest affinities for hard bases are hard acids. Hard acids are usually cations of electropositive metals; consequently, they are relatively nonpolarizable and have higher charge-to-radius ratios. Hard acids prefer to bind to hard bases.

Examples of hard acids: H⁺, Li⁺, Na⁺, K⁺, Be²⁺, Mg²⁺, Ca²⁺, VO²⁺, Al³⁺, Sc³⁺, Cr³⁺, Ti⁴⁺

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