An ion is an atom or molecule with a positive (+) or negative (-) charge.
The charge results from an imbalance between the number of protons (+) and the number of electrons (-).
The following illustrates a high speed neutron, perhaps from a nearby nuclear explosion, knocking an electron out of its orbit around a helium atom, forming a helium ion.
A balanced, neutral atom is not attracted to other positive or negative objects such as magnets.
"Opposite charges attract, and like charges repel."
Which would most likely be attracted to the negative (-) end of a
refrigerator magnet?
| a. He
b. He+ c. He- |
Preview
Stuff you will see in coming chapters.
The attraction and repulsion of ions is a major force in cells driving everything from muscle contraction to nerve transmission. If you want a demonstration, then run in the heat all day and drink only distilled water, no Gatorade.
Other activities in the body that rely on ion attractions in cells.