Remember that the names of the elements are not capitalized (unless they are the first word in a sentence). If you are given the symbol, write the name of the element. If you are given the name, write the symbol. Spelling counts.
copper
sodium
Al
F
P
iron
silver
Zn
Ca
Ni
silicon
S
tin
Kr
chlorine
cobalt
magnesium
barium
mercury
tungsten