Group 7, the Halogens

Group 7, the Halogens

Group 7, the Halogens WALT Explain the properties of SALT FORMERS WILF Questions answered Representative Representative Elements Elements 2 Group 7The Halogen Group All the elements in Group 7 are nonmetals except for astatine (a radioactive metalloid) Halogens = saltformer.

All of the halogens form salts with sodium and with the other alkali metals. Representative Representative Elements Elements Group 17The Halogen Group The halogen fluorine is the most reactive of the halogens in combining with other elements. Chlorine less reactive than fluorine, bromine less reactive than chlorine. Iodine is the least reactive of the four

nonmetals. How does this compare with the reactivity of group 1 metals? Decreasin g reactivity Some facts 1) Reactivity DECREASES as you go down the group (This is because the electrons are further away from the nucleus and so any extra electrons arent attracted as

much). 2) They exist as diatomic molecules (so that they both have a full outer shell): Cl Cl 3) Because of this fluorine and chlorine are liquid at room temperature and bromine is a gas The halogens some reactions

1) Halogen + metal: + + Na Cl Halogen + metal salt 2) Halogen + non-metal: H +

Cl Halogen + non-metal Cl Na ionic Cl covalent H

Section Section Check Check Question 1 What does the term halogen mean? Section Section Check Check Answer Halogen means saltformer. All the halogens form salts with sodium (and other alkali metals).

Finish answering questions on Noble Gases, Pg133 Answer questions on Halogens, pg 131 As you are doing this QUIETLY I shall hand out the test papers Displacement reactions To put it simply, a MORE reactive halogen will displace a LESS reactive halogen from a solution of its salt. Cl Br I

Decreasing reactivity F Chlorin e Cl2 Bromin e Br2 Iodine I2 Potassium chloride Potassium bromide

KCl(aq) KBr(aq) Potassium iodide KI (aq) Halogen compounds Silver halides (e.g. silver chloride, silver bromide etc) These are used in photographic paper. They are reduced by light and x-ray radiation to leave a silver photographic image. Hydrogen halides (e.g. hydrogen chloride, hydrogen fluoride)

When these dissolve in water they make acids and will This powerpoint was kindly donated to www.worldofteaching.com http://www.worldofteaching.com is home to over a thousand powerpoints submitted by teachers. This is a completely free site and requires no registration. Please visit and I hope it will help in your teaching.

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