Define a solar system identify the components of the solar systemlist the various planets and the facts about each answer asap

Which of the following statements is true? a. elements in the last period are radioactive. b. atomic weight is the same as atomic mass. c. elements in the same group have the same number of electron shells. d. atomic number equals the number of neutrons in the nucleus of an atom.

If you burn 10 kilograms of wood in a fire (combustion) what is the weight of the products after the fire has finished burning the wood?

Particles vibrate in a rigid structure and do not move relative to their neighbors.