Properties of the Groups
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group 1 alkali metals properties
• good conductors of electricity and heat • low density • grey shiny surfaces when freshly cut with a knife • very reactive • form ionic compounds with non-metals
alkali metals reaction with water lithium sodium potassium
lithium • floats and reacts slowly • releases hydrogen • keeps its shape sodium • vigorous release of hydrogen • metal is melted and forms a small ball that moves around on water surface potassium • reacts more vigorously • sufficient heat to ignite hydrogen • lilac-colored flame • moves excitedly on water surface
group 17 halogens properties
• colored • gradual change from gases (F and Cl) to liquid (Br) to solid (I and At) • very reactive non-metals • form ionic compounds with metals f • orm covalent compounds with non-metals
what do halogens react with group 1 metals to form?
halides