(b) Comment on the
(ii) colour of group $17$ elements.

Halogens are colored non-metals. The intensity of the color of the element also increases from pale to dark. Their colours can be given as,

Element	Colour
Fluorine	Pale yellow
Chlorine	Greenish-yellow
Bromine	Reddish-brown
Iodine	Violet
Astatine	Black