No. The most nonactive family on the periodic table is the Noble Gases, because they have a full valence electron shell and cannot bond with other atoms. The noble gases are considered as "chemically stable."
It's known as chromium (III) sulphate which is green in colour.
I believe A.
Calcium and potassium help with blood pressure, muscles, and bones.
For b, there is little helium in the atmosphere.
For C, the center is made of neutrons and protons, electrons are far away.