Anita Akweshie-
atomic radius increases
down the group
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melting point decreases
down the group
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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
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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
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reaction with oxygen
will burn in oxygen to form oxides
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describe MgO
white solid with high melting point due to ionic bonding
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reactivity of metals increases
down the group
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what needs to be done to Mg ribbon before reactions
cleaned with sand/emery paper to remove the oxide layer
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magnesium burns in steam to produce
magnesium oxide and hydrogen
bright white flame
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magnesium reacts with warm water to produce
magnesium hydroxide and hydrogen gas
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metals react with cold water to produce
hydroxides and hydrogen
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observations with cold water
fizzing
metal dissolving
solution heating up
(with calcium, a white ppt) less ppt formation down the group
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reactions get more vigorous
down the group
