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capitals SNGS

training on 26 march 2009

QuestionAnswer
chlorine has a low bpt VAN DER WAALS FORCES OR INTERMOLECULAR FORCES ARE WEAK. LITTLE ENERGY NEEDED TO OVERCOME FORCES.
IONIC compounds have HIGH mpts ELECTROSTATIC FORCES OF ATTRACTION BTW OPPOSITELY CHARGED IONS ARE VERY STRONG. HUGE AMOUNT OF ENERGY TO BREAK BONDS.
METALS ARE GOOD ELECTRICAL CONDUCTORS. THE VALENCE ELECTRONS OF THE METAL ATOMS ARE DELOCALISED. THESE DELOCALISED ELECTRONS ARE MOBILE AND MOVE FREELY BETWEEN THE POSITIVE METAL IONS.
GRAPHITE IS SOFT THE VAN DER WAALS FORCES BTW THE LAYERS OF CARBON ATOMS ARE WEAK. THEY CAN SLIDE EASILY OVER ONE ANOTHER.
DIAMOND DOES NOT CONDUCT ECITY EACH CARBON ATOM USES UP ALL ITS 4 VALENCE ELECTRONS FOR BONDING WITH OTHER CARBON ATOMS. SO NO FREE ELECTRON REMAINING TO CONNDUCT CURRENT.
Created by: alexteoh