Groups on the periodic table

Group 1: Alkali Metals

°Li, Na, K, Rb, Cs, Fr

°they have low densities

°Soft

°Are good conductors of heat & electricity

°Form cations with +1 charge

°React vigourously with water

Group 2: Alkali Earth Metals

° Be, Mg, Ca, St, Ba

° Silvery

° Form cations with +2 charge

° Reactivity witb water increases down the group

° Good conductors of heat & electricity

° Burn in air to form solid oxides

Group 17: Halogens

° Diatomic eg. Cl², F², Be², I²

° F² & Cl² are yellow to green gases

° Br² is a reddish brown liquid

° I² form purple crystals

° All halogens arw non-metals

° Form anions with the charge -1

° They havd low melting points and boiling points.

Group 18: Noble Gases

° He, Ne, Ar, Kr, Xe, Rn

° They re extremely unreactive. A few krypton and xenon compounds are known, therefore reactivity increase down the group

° Boiling poibts increase down the group