Which describes the experiments of Becquerel and the Curies? Becquerel showed that uranium requires x-rays to form radiation, and the Curies coined the term “radioactivity.”
Becquerel coined the term “radioactivity,” and the Curies showed that uranium requires x-rays to form radiation.
Becquerel discovered other radioactive elements, and the Curies showed that uranium gave off radioactivity.
Becquerel showed that uranium gave off radioactivity, and the Curies discovered other radioactive elements.

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.

Consider the nuclear equation below. 239 > x + 4 he 94 2 what is x? 1.235 cm 96 2.243 u 92 3.235 u 92 4.243 cm 96

What is the number of moles in 15.0 g ash3?