Elements in group 18, at the far right of the periodic table, are called what?

transition metals

noble gases

alkaline metals

halogens

An observer that stands still as the electron moves by him, will observe

The human body stores chemical energy from digested food. some of the chemical energy is converted into mechanical energy when the body moves. which statement best supported by this information

However, had it been a real sound, the sound's pitch would have been increased by the doppler effect, since the falcon was moving the source of the sound. perpendicular to away from towards at the same speed as