H2O
 Given the chemical formula, how is this substance MOST LIKELY classified?
 A) atom 
 B) compound 
 C) both atom and compound 
 D) neither atom nor compound 
 H2O
 Given the chemical formula, how is this substance MOST LIKELY classified?
 A) atom 
 B) compound 
 C) both atom and compound 
 D) neither atom nor compound