Which of these is a mixture?

carbon

carbon dioxide

air

oxygen

Place the elements below in order of decreasing ionization energy. aluminum(al) chlorine(cl) magnesium (mg) sulfur(s)

The graph indicates the running route for tobias. which best describes his run? from time 0 to 6, he went fast and then slowed down. from time 6 to 10, he was at his slowest. from time 12 to 14, he went very slow. from time 14 to 18, he went toward the starting point.

Nuclear decay is the spontaneous decay of one element into a. an x-ray b. a ray of light c. another element