atomic radius increases
down the group
melting point decreases
down the group
why does the melting point decrease down the group
metallic bonding weakens as the atomic size increases
electrostatic attraction between the nucleus and delocalised electrons decreases
why is the first ionisation energy the lowest
outermost electrons are held weakly as they are the furthest from the nucleus and are most shielded and are attracted weakly
reaction with oxygen
will burn in oxygen to form oxides
describe MgO
white solid with high melting point due to ionic bonding
reactivity of metals increases
down the group
what needs to be done to Mg ribbon before reactions
cleaned with sand/emery paper to remove the oxide layer
magnesium burns in steam to produce
magnesium oxide and hydrogen
bright white flame
magnesium reacts with warm water to produce
magnesium hydroxide and hydrogen gas
metals react with cold water to produce
hydroxides and hydrogen
observations with cold water
fizzing
metal dissolving
solution heating up
(with calcium, a white ppt) less ppt formation down the group
reactions get more vigorous
down the group