First slide

Electronic configuration and Atomic , physical properties

Question

X, Y, B and P are the elements belonging to 17^th group of Modern periodic table. The correct trend of oxidizing power ofthese elements is X₂ > Y₂ > B₂> P₂. The element ‘P’ in the sequence is

Easy

A

Cl
B

F
C

I
D

Br

Solution

Atomic radius….F<Cl<Br<I;
Density ….F<Cl<Br<I;
IP ….F>Cl>Br>I;
EN ….F>Cl>Br>I;
Electron gain enthalpy ….I<Br<F<Cl; Due to small size and inter electronic repulsions in Fluorine ;
IP …..I^-<Br^-<F^-<Cl^-;
IP trend….F>Cl>Br>I>Cl^->F^->Br^->I^-
B.D.E….Cl₂>Br₂>F₂>I₂; Due to small size and repulsions between lone pairs on adjacent Fluorine atoms ;
IP …..I^-<Br^-<F^-<Cl^-;
Reactivity and oxidizing power…..F₂>Cl₂>Br₂>I₂;
Due to high hydration enthalpy of F^- and low B.D.E of F₂, F₂ is the strongest oxidant and highly reactive;
SRP Values of $E_{\frac{1}{2} F_{2} / F^{-}}^{0} (+ 2.87 V) > E_{\frac{1}{2} {Cl}_{2} / {Cl}^{-}}^{0} (+ 1.36 V) > E_{\frac{1}{2} {Br}_{2} / {Br}^{-}}^{0} (+ 1.08 V) > E_{\frac{1}{2} I_{2} / I^{-}}^{0} (+ 0.54 V)$ ;
Reducing power….I^- > Br^- > Cl^- > F^- ;
Hydration enthalpy…F^->Cl^->Br^->I^-;
MP and BP ….F₂<Cl₂<Br₂<I₂; Due to increased strength of London dispersion forces;

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