Group 2 Flashcards
What is the electron arrangement for all Group 2 elements?
-2 electrons in outer s orbital
How does atomic radius change down group 2?
atoms bigger
each element has extra filled main level to previous
What is the trend in melting point down group 2?
from calcium…
it decreases
Why does the melting point of group 2 elements decrease down the group?
sea of delocalised electrons further from positive nuclei
weakens strength of metallic bonds
Which group 2 element has the lowest boiling point?
magnesium
What happens in first ionisation energy of group 2 elements?
lose 2 outer electrons to form +2 ions
What is the trend in first ionisation energy down group 2?
decreases
Why does first ionisation energy decrease down group 2?
more shielding by inner shells
electrons further from nucleus
Are group 2 elements oxidised or reduced?
all oxidised
What is the trend in reactivity when group 2 reacts with water?
down the group it increases
What is the basic reaction to show how group 2 reacts with water?
M(s) + 2H2O(l) > M(OH)2(aq) + H2(g)
M represents any group 2 element
How does magnesium react with water?
slowly
How does magnesium react with steam?
rapidly
What is the equation for the reaction between magnesium and steam?
Mg(s) + H2O(g) > MgO(s) + H2(g)
What is magnesium hydroxide used for?
as milk of magnesia in indigestion remedies to neutralise excess stomach acid
