List three characteristics of chemical reactions and three characteristics of nuclear reactions.

Answer:

Chemical reactions: 1) Involve the loss, gain, or sharing of valence electrons. 2) The nucleus of the atoms remains unchanged. 3) They involve relatively low energy changes. Nuclear reactions: 1) Involve changes in the nucleus of an atom. 2) Often result in the transmutation of elements and the production of new particles. 3) They involve very high energy changes and can involve changes in the mass of the atom.