Atomic Structure

4. the force that causes one object to push another object away from itself.
7. one of the three major parts of an atom. Carries a negative charge.
8. one of the three principal parts of an atom. Has a positive charge.
10. current that reverses its direction of flow periodically. Reversals generally occur at regular intervals.
11. an electric charge developed when an object contains more protons than electrons.
16. the smallest part of a compound that is made of individual atoms.
17. a material that contains four valence electrons and is used in the production of solid-state devices.
19. a material used to isolate two conductive surfaces.
21. the shell in which an electron moves around the nucleus of an atom.
22. the center or middle.

1. anything that occupies space.
2. moving in only one direction.
3. electrons located in the outer orbit of an atom.
5. one of the principal parts of an atom. Has no charge and is part of the nucleus.
6. current that does not reverse its direction of flow.
9. the force that causes one object to pull another object to itself.
12. a device or material that permits current to flow through it easily.
13. one polarity of a voltage, current, or charge that has an excess of electrons.
14. an object that moves in two directions.
15. the smallest part of an element that contains all the properties of that element.
18. (1) one of the basic building blocks of nature. An atom is the smallest part of this; (2) one part of a group of devices.
20. This number is equal to the number of protons (positively charged particles) in the nucleus of an atom.