Ch. 16 Sabrien

3. cloud region of negative charge surrounding an atomic nucleus that is associated with an atomic orbital.
8. dot diagram diagrams in which the valence electrons of an atom are shown as dots distributed around the element's symbol
9. number an integer that approximates the mass of an isotope
10. occurring over
11. number the number of a chemical element in the periodic system
13. uncharged elementary particle that has a mass nearly equal to that of the proton.
14. two or more figures forming a complete unit in a composition went there as a group

1. several elementary particles that are postulated to come in pairs.
2. core of an atom that has a positive charge.
4. negatively charged subatomic particle.
5. particle with a positive charge that is in the nucleus of an atom.
6. smallest particle of an element that retains the elements property.
7. table a substance that cannot be broken down into any other substance
11. atomic mass atomic weight
12. variants of chemical elements that possess the same number of protons and electrons, but a different number of neutrons