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NC physical science
holt science chapter 12
| Question | Answer |
|---|---|
| Periodic | describes something that occurs or repeats at regular intervals |
| Periodic Law | the law that states that the repeating chemical and physical properties of elements change periodically with the atomic numbers of the elements |
| What property is used to arrange elements in the periodic table | elements are arranged based on increasing atomic mass |
| Period | a horizontal row of elements in the periodic table |
| Group | a vertical column of elements in the periodic table |
| Group 1 | Alkali metals |
| Group 2 | Alkaline-Earth metals |
| Group 3-12 | Transition Metals |
| Group 13 | Boron |
| Group 14 | Carbon |
| Group 15 | Nitrogen |
| Group 16 | Oxygen |
| Group 17 | Halogens |
| Group 18 | noble gas |
| Why are noble gases unreactive | Atoms of noble gases have a full set of electrons in their outer level |