Which statement describes an atomic nucleus? O An atomic nucleus is negatively charged.
O An atomic nucleus has no electrical charge.
O An atomic nucleus consists of mostly empty space.
O An atomic nucleus contains most of the atom's mass.

Which of the following warnings would an agricultural chemist tell a farmer who wants to recycle his or her own ammonia? recycling ammonia is a difficult process that sometimes takes weeks. recycling ammonia requires a degree in biochemistry or a related field. recycling ammonia can be harmful because it is highly flammable and toxic. recycling ammonia costs too much money considering the price of the necessary chemicals.