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chemical bondsmultiplyingdefinite proportionscompound
gram molecular massheteroatomic molecule\(Ne\)adding
threenoble gases\(HCl\)two
polyatomic moleculetriatomic moleculediatomic moleculehomoatomic molecule
  
1.
According to the law of __________, a molecule may contain atoms of the same element or contain atoms of two or more elements joined in a fixed ratio.
 
2.
When a molecule has the atomicity greater than three, it is said to be ___________.
 
3.
The term __________ refers to a heteroatomic molecule.