First slide
Electronic configuration and Atomic , physical properties

J, Q, Y and A are the elements belonging to 17th group of Modern periodic table. The correct trend of electronegativity in these elements is J > Q > Y > A. The element ‘Q’ in the sequence is


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;

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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