1. activation energy is a) the heat released in a reaction b) the energy barrier between reactants and products c) the energy given off when reactants collide d) generally very high for a reaction that takes place rapidly

In chemistry, the type of an atom (what element it is) is determined by: a) the number of protons it contains in its nucleus.b) the number of neutrons it contains in its nucleus.c) the number of protons it has in a cloud around the nucleus.d) the number of neutrons it has in a cloud around the nucleus.e) the number of electrons it exchanges with its neighbors.