MHT CET · Chemistry · Redox Reactions
Which of the following element in +1 oxidation state has largest ionic radius?
- A Rb
- B K
- C Na
- D Li
Answer & Solution
Correct Answer
(A) Rb
Step-by-step Solution
Detailed explanation
The ionic radius of alkali metals increases down the group.
The number of occupied shells in \(\mathrm{Rb}^{+}\) (4 shells) is more than that in \(\mathrm{K}^{+}\)(3 shells), \(\mathrm{Na}^{+}\)(2 shells) and \(\mathrm{Li}^{+}\)(1 shell). Thus, it experiences smaller effective nuclear charge.
\(\therefore \quad \mathrm{Rb}^{+}\)has largest ionic radius than among other elements.
The number of occupied shells in \(\mathrm{Rb}^{+}\) (4 shells) is more than that in \(\mathrm{K}^{+}\)(3 shells), \(\mathrm{Na}^{+}\)(2 shells) and \(\mathrm{Li}^{+}\)(1 shell). Thus, it experiences smaller effective nuclear charge.
\(\therefore \quad \mathrm{Rb}^{+}\)has largest ionic radius than among other elements.
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