Answer:
The mass number is the sum of protons and neutrons. This means to find the number of neutrons you subtract the number of protons from the mass number. On the periodic table, the atomic number is the number of protons, and the atomic mass is the mass number.
Explanation:
It has 78 neutrons in a cesium
Bottle 1 is a compound bottle 2 is element bottle 3 is a element bottle 4 is a element
