3. Joey pushes on a box with 15N of force to the left, and Annie pushes on the box with 18N of force to the right. What is the net force and direction on the box? (1)

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?