| chemical bonds | multiplying | definite proportions | compound |
| gram molecular mass | heteroatomic molecule | \(Ne\) | adding |
| three | noble gases | \(HCl\) | two |
| polyatomic molecule | triatomic molecule | diatomic molecule | homoatomic molecule |
1.
When a molecule is made of a similar kind of atom, it is called __________.
2.
When the molecular mass of a compound is expressed in grams, it is called __________.
3.
Diatomic molecules are made up of __________ atoms that are chemically bonded.