What are some properties of Halogens?

Question

please help! :)

Answer 1

All form diatomic molecules, are highly reactive, and as elements are colored. They can form ionic compounds with electropositive metals, and substitute for hydrogen in hydrocarbons to make a vast array of compounds. All have stable isotopes except astatine.

Answer 2

They are the five (5) elements of Group VII of the Periodic Table of the Elements. They are fluorine, chlorine, bromine, iodine, and astatine. In isolated form, they form diatomic molecules. They have the highest electronegativity (attraction for electrons) of all the elements. They have low melting and boiling points. They combine readily with metals to form salts (in other words, they corrode them). They substitute for hydrogen in organic compounds to make some really INTERESTING substances!! For example, the halon family of gases used in certain kinds of fire extinguishers, they are CFC's: chlorofluoocarbons. Another example; PCB's: polychlorinated biphenyls. And another; CCL4: carbon tetrachloride, a poisonous, colorless liquid at room temperature, used as an industrial solvent. Any organic chemistry textbook will have a couple of chapters exclusively on halogenated compounds.

Answer 3

They are toxic. They undergo free-radical reactions. Some of them are pretty colors, and they are either gasses or boil/sublime easily.