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Halogens are elements that can be found in group 7 of the periodic table. They have 7 electrons in their outer shell and thus can form only a single covalent bond with other elements. Examples of halogens include chlorine, bromine and fluorine. A carbon compound that is covalently bonded with chlorine or bromine is called a halocarbon.
A catalyst is a substance that increases the rate of a chemical reaction without itself being consumed . (ans: second choice)
2 is your answer hope you get it right
