hydrogen
helium
lithium
beryllium
boron
carbon
nitrogen
oxygen
fluorine
neon
sodium
magnesium
aluminium
silicon
phosphorus
sulphur
clorine
agron
potassium
calcium
the first answer is wrong IRON THEN COBALT ONLY AFTER THAT IS NICKEL.. SO THE TABLE IS BASICALLY:
hydrogen
helium
lithium
beryllium
boron
carbon
nitrogen
oxygen
fluorine
neon
sodium
magnesium
aluminium
silicon
phosphorus
sulphur
clorine
agron
potassium
calcium
scandium
titanium
vanadium
chromium
manganese
iron
cobalt
nickel
copper
zinc