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____________________ calci
____________________ rubidi
Sr ____________________
Na ____________________
____________________ carboni
____________________ arsènic
Cs ____________________
Fr ____________________
____________________ magnesi
____________________ bari
N ____________________
K ____________________
____________________ alumini
Si ____________________
____________________ beril·li
____________________ estany
Sb ____________________
P ____________________
____________________ bor
____________________ plo m