Periodic Table

2. any smaller part of an atom such as a proton, neutron, or electron.
3. - the ability of an atom to attract additional electrons.
6. exclusion principle - when an orbital holds two electrons, the electrons much have opposite spin.
7. atomic mass - a weighted average of all of the isotopes of that element in the universe.
9. shell - the outer-most energy level of an electron.
11. - a negatively charged ion.
15. - the same element with different numbers of neutrons.
17. nuclear charge (Zsubeff) - the net positive charge experienced by the valence electrons from the nucleus.
20. - a physical, conceptual, or mathematical representation of a real phenomenon whose purpose is to explain and predict the observed phenomenon.
21. - a specific amount of energy that can be absorbed by an electron as it moves from ground state to excited state, or released by an electron as it falls from the excited state back to ground state.
22. - an atom with a positive or negative charge.
23. state - the lowest energy state within electron orbitals.

1. - a region of space around the nucleus of an atom where an electron is likely to be found.
4. - a positively charged ion.
5. electrons - electrons on the outer-most energy level of any atom.
8. Rule - When placing electrons in equal energy orbitals, electrons should not be paired until each equal energy orbital contains one electron.
10. state - an atom, ion or molecule with an electron in a higher than normal energy level than its ground state.
12. configuration - the order in which electrons are arranged in an atom.
13. energy - the amount of energy required to remove one valence electron from an atom.
14. radius - the distance from the atom's nucleus to the outermost energy level.
16. - a tiny particle with a negative charge that is found outside the nucleus of an atom.
18. sublevel - a smaller part within a primary energy level.
19. number - the number of protons in the nucleus of an atom.