"When waves refract (move through a new material) such as from air--> water, waves change their speed." O True
False

Nonpoint source pollution is difficult to control because it

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?

The number of neutrons is equal to the atomic number minus the atomic mass. a. true b. false