Question

Which one have more negative value of E°(A) Rb(B) Cs(C) Li(D) Na​

Answer 1

Answer:

Li

Explanation:

The reduction potential of the lithium will be most negative. It will be best oxidising agent.

Values for Li, K and Na is as follows.

Li+    +     e → Li          - 3.05 V

K+     +     e→ K           - 2.93 V

Na+    +   e→ Na         - 2.71 V

these all the reduction potential

Li+ being the smallest and having inert gas configuration won't accept electron due to the electron repulsion

Answer 2

Lithium have more negative value of E°.

Option: C

Explanation:  

• Since Lithium consists of only two orbitals, the radius of the lithium atom is the least as compared to other alkali metals.  

• As a result, the electron which is in the valence shell of lithium is much closer to the nucleus.

• So when another electron approaches the valence electron it experiences much higher force of repulsion.  

• Due to this, it is one of the most useful reducing agent. Lithium has the highest negative value of electron affinity.

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