The number of molecules of a chemical that is equal to its molecular weight in grams, is a(n) ?

Which statement describes both homogeneous mixtures and heterogeneous mixtures?

What is the independent variable in this investigation? mass volume sample number substance density

What are the first two quantum numbers for the electrons located in subshell 4d? what are the first three quantum numbers for the electrons located in subshell 2s? how many electrons can be held in a sublevel l = 3? how many electrons can be held in the energy level n = 4? how many electrons in an atom can share the quantum numbers n = 4 and l = 3?