Topic 9 0.0 / 5 ? ChemistryGroup 2ASAQA Created by: Jemma1494Created on: 03-06-21 17:03 What ions do group 2 metals form 2+ cations 1 of 7 Group 2 atomic radius trend Increases down group 2 Due to increased e- shielding making nuclear charge attraction weaker 2 of 7 Group 2 melting point trend Decreases down group 2 Due to increased e- shielding meaning the delocalised electrons are further from the nucleus Mg = anomaly - higher due to crystal structure 3 of 7 Group 2 ionisation energy trend Decreases down group 2 Due to increases e- shielding making it easier to remove electrons 4 of 7 Barium uses Barium nitrate / barium chloride is used to test for sulfate ions (White barium sulfate precipitate) 5 of 7 Group 2 reactions with SO4(2-) M(2+) + SO4(2-) -> MSO4 Group 2 sulfates decrease in solubility down the group 6 of 7 Group 2 reactions with H2O M + 2H2O -> M(OH)2 + H2 Group 2 hydroxides increase in solubility down the group 7 of 7
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