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simbolos de elementos quimicos
Autor :
Ana Delia Ramirez Azofeifa
Cesio
polonio
plata
niobio
estroncio
hierro
arsenico
cobalto
Helio
As ____________________ , Po ____________________ , ____________________ Ag , ____________________ Sr , ____________________ Nb , Fe ____________________ , Co ____________________ , ____________________ Cs , ____________________ H e