What is the element Ar classified as in the periodic table? a noble gas a halogen a metalloid a metal

In a sample of oxygen gas at room temperature, the average kinetic energy of all the balls stays constant. which postulate of kinetic molecular theory best explains how this is possible? a. attractive forces between gas particles are negligible because the particles of an ideal gas are moving so quickly. b. collisions between gas particles are elastic; there is no net gain or loss of kinetic energy. c. gases consist of a large number of small particles, with a lot of space between the particles. d. gas particles are in constant, random motion, and higher kinetic energy means faster movement.

An electrons position cannot be known precisely only it's probability of being in a certain location can be known

Stage in which a star’s outer layers have started to cool and grow outward?