Which of the following ions is the strongest oxidising agent?

(Atomic Number of Ce = 58, Eu = 63, Tb = 65, Lu = 71)

(a) \quad (b) \quad (c) \quad (d)

Question

Which of the following ions is the strongest oxidising agent?

(Atomic Number of Ce = 58, Eu = 63, Tb = 65, Lu = 71)

(a)  \quad (b)  \quad (c)  \quad (d)

Canvas Classes · Accepted Answer

Oxidising agent = species that gains electrons (gets reduced).

The stronger the tendency to gain electrons, the stronger the oxidising agent.

Electronic configurations:

| Ion | Config | Tendency |
|---|---|---|
|  |  | Stable, no tendency to gain e⁻ |
|  |  | Half-filled, stable — reducing agent |
|  |  | Stable +3 state |
|  |  | Strongly wants to gain 1e⁻ to reach stable  wait: Tb³⁺ = , Tb⁴⁺ =  |

Tb⁴⁺ has  (half-filled) configuration and strongly tends to gain an electron to reach  (). Act

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