The subatomic particles that identifies an element and also represents its atomic number would be A. The number of protons.
A serial dilution is the stepwise dilution of a substance in solution. Usually the dilution factor at each step is constant, resulting in a geometric progression of the concentration in a logarithmic fashion.
Answer:
1. B
2. D. the form of a substance changes but not its identity
3. C
4. D
