When parallel light rays exit a concave lens, they This is not serious but HELP ME! I to get a grade

:p

Why is nh3 classified as a polar molecule

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?

Anyone who's in connections academy chemistry b have the factors that affect the rate of a reaction portfolio already done?