Which of these is NOT a type of galaxy?
OA) spiral
OB) elliptical
OC) irregular
OD) rectangular

Which of these best describes an ionic bond?

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?

Find the mass, in grams, of 5.00*10^23 molecules of f2