Group 7, the Halogens

Group 7, the Halogens

Group 7, the Halogens Representative Representative Elements Elements 2 Group 17The Halogen Group All the elements in Group 17 are nonmetals except for astatine, which is a radioactive metalloid. These elements are called halogens, which means salt-former. 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 is less reactive than fluorine, and bromine is less reactive than chlorine. Iodine is the least reactive of the four nonmetals.

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 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

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).

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