Na+ is a solution. a mixture. a compound. an ion

Who is better, messi or cristiano, i need this for a chemistry class. asap

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?

Select the correct location on the image identify the element that humans need to breathe. 2015 er r ights reserved