Question

9.Compounds are formed when
1 point
The ratio of masses of combining atoms is fixed
By a chemical change
When a substance contains identical molecules
All the above​​

Answer 1

Answer:

The answer is that compounds are formed when elements are joined and held together by strong forces called chemical bonds. These bonds involve the electrons that orbit the nucleus of the atom. Electrons are located in energy levels that occur at certain distances from the nucleus, called shells.