Question

why all halogen family members are coloured? ​

Answer 1

Answer:

Halogens are coloured because of there low ionization energy, thereby the electron gets excited by absorbing visible region of light. Reflected light thus impart the complimentary colour to the molecule.

Answer 2

Hiiii

Your answer is

because of there low ionization energy, thereby the electron gets excited by absorbing visible region of light.

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