The atomic number defines the number of protons in an atom.
Answer:
length
Explanation:
cm measures length. Think of a ruler.
A generator because they connect each other in physical attraction
I believe the atomic level increases hope this helps.
Answer: The density of the object will be 
Explanation:
Density is defined as the mass contained per unit volume.

Given : Mass of object = 19.6 grams
Volume of object= 
Putting in the values we get:

Thus density of the object will be 