group 1 - the alkali metals

AS YOU GO DOWN:

bigger atoms - ONE EXTRA FULL SHELL OF ELECTRONS FOR EACH ROW YOU GO DOWN

MORE REACTIVE - BECASUE THE OUTER ELECTRON IS MORE EASILY LOST BECAUSE ITS FURTHER FROM THE NUCLEUS

HIGHER DENSITY - HIGHER DENSITY BECASUE THE ATOMS HAVE MORE MASS, THE THREE AT THE TOP ARE LESS DENSE THAN WATER

LOWER MELTHING POINT

LOWER BOILING POINT

they are very reactive - have to be stored in oil becasue they react with the air around it 

THEY ALL HAVE ONE OUTER ELECTON - AND FORM AN IONIC BOND

• They react with water to produce hydrogen gas
• when lithium, sodium and potassium are put in water, they react vigorously
• they move around the surface, fizzing furiously
• They produce hydrogen, potassium aslso gets hot enough to ignite it
• they would form a hydroxide in solution