Why is the atomic mass for calcium a decimal?

Order the following from smallest to largest atom, electron, quark, proton, neutron, molecule, nucleus

If i can still dissolve more sugar into the solution at a certain temperature what would i call that solution

What is the correct name for the compound cocl3? a) cobalt(i) chloride b) cobalt(i) chlorate c) cobalt(ii) chlorate d) cobalt(iii) chloride