What is the best description of the bohr model of the atom? the atom consists of a positively charged material with negatively charged electrons embedded within it. the atom consists of a nucleus with electrons orbiting randomly around it. the atom consists of a nucleus with electrons orbiting at specific energy levels. absorbed photons cause electrons to jump between energy levels. the atom consists of a nucleus surrounded by a region containing electrons. electrons cannot be located exactly

Figure 10-1 study figure 10-1. the strong nuclear force felt by a single proton in a large nucleus

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.

What is the result of multiplying (2.5 × 1010) × (2.0 × 10-7)? a. 5.0 × 103 b. 5.0 × 10-3 c. 5.0 × 1017 d. 5.0 × 10-17