Answer:
Explanation:
The elements of group 17 are called halogens. These are six elements Fluorine, Chlorine, Bromine, Iodine, Astatine. Halogens are very reactive these elements can not be found free in nature. Their chemical properties are resemble greatly with each other.
Fluorine:
it is flammable gas.
It has pungent smell.
its reactions with all other elements are very vigorous except neon, oxygen, krypton and helium.
It has adverse effect on human health. It is absorbed and lead to teeth decay.
It effects the nerves, kidney and muscles.
It causes osteoporosis.
Chlorine:
it is greenish-yellow irritating gas.
it is disinfectant and can kill the bacteria.
it is also used in manufacturing of paper, paints and textile industries.
It also have some adverse effect on human health such as it can effect the respiratory system, immune system and heart.
Bromine:
it is present in reddish brown color.
it has pungent odor.
it is very corrosive for human tissues.
Its vapors create irritation in throat and eyes.
In organic form it causes our lungs, gastrointestinal track and stomach.
Iodine:
It is very corrosive and has pungent odor.
It is used for thyroid treatment but large exposure to its radiations cause the tissue damage.
