chemistry c4 0.0 / 5 ? ChemistryChemical patterns and reactivity seriesRate of reactionRocks, ores, metals and alloysGCSEOCR Created by: Alex1Created on: 02-03-18 13:29 they have low melting points, they have a low density and they are very soft. they're in group 1 on the periodic table alkali metals 1 of 8 if a group 1 metal is put in cold water what is produced hydroxide and hydrogen gas 2 of 8 what are the group 7 elements known as the halogens 3 of 8 does the reactivity increase or decrease when you go down group 7 decreases 4 of 8 what is the colour of the group 0 elements colourless 5 of 8 what is the most reactive metal potassium 6 of 8 what is the least reactive metal silver 7 of 8 they're non flammable nobel gases 8 of 8
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