The amount of energy required to move an electron from one energy level to the next higher one is known as: a. quantum of energy b. aufbau principle c. mass number d. atomic number

Each pair of clay balls represents to planetesimals if each plane test molluscum pound of the same material and is separated by the same distance which pair experiences the greatest gravitational attraction

In which phase(s) do the molecules take the shape of the container?

Which of the following observations indicates that there is a small, dense, positively charged part in the center of an atom? some uncharged particles are scattered by a gold foil. all uncharged particles are attracted towards a gold foil. all positively charged particles pass straight through a gold foil. some positively charged particles bounce back from a gold foil.