What best describes the outer shell of the atoms in Group D on this illustration of the Periodic Table? are empty are full are half full need 1 more electron to be full

Look at the potential energy diagram for a chemical reaction. which statement correctly describes the energy changes that occur in the forward reaction?

The heliocentric and the geocentric models of the solar system included these central principles

Arailroad car collides with and sticks to an identical railroad car that is initially at rest. after the collision, the total kinetic energy of the two cars is a) the same as before. b) half as much as before. c) one third as much as before. d) one fourth as much as before. e) twice as much as before.