Most atoms do not. For those atoms that do not have a full valence shell (which usually would contain eight electrons, except for hydrogen and helium, where it would contain two), something has to change. So nature's tendency toward a full valence shell will lead to one of two things: The gain or loss of electrons.
The answer would be A) sand, it is not soluble in water
nasal cavities (or oral cavity) > pharynx > trachea > primary bronchi (right & left) > secondary bronchi > tertiary bronchi > bronchioles > alveoli (site of gas exchange)
Balanced equation:
Ca(OH)2+H2SO4=CaSO4+2 H20<span />
The chemical change that involves breaking down substances using electricity is C. Electrolysis.
