Give the number of protons, electrons, and neutrons in the following atoms a. 90zr b. 202hg c. 58ni d.222rn

Significant figures are digits read directly from the measuring instrument plus one more digit, which is __ by the observer.

Chemical energy is a form of a. kinetic energy only. b. both potential and kinetic energy. c. neither potential nor kinetic energy. d. potential energy only. reset

8.98 dm3 of hydrogen gas is collected at 38.8 °c. find the volume the gas will occupy at -39.9 °c if the pressure remains constant.