Answer:
1. If an atom of calcium has a mass of 40:
a. Protons =
20
b. Neutrons =
20
2. If an atom of krypton has a mass of 84:
a. Protons =
36
b. Neutrons =
48
3. If an atom of tin has a mass of 119:
a. Protons =
50
b. Neutrons =
69
4. If an atom of tungsten has a mass of 184:
a. Protons
= 74
b. Neutrons =110
