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CPT 3 PT 2
| Term | Definition |
|---|---|
| elements | matter made up of only one kind of atom |
| #of natural and synthetic | 90 natural 25+ synthetic |
| periodic table | chart to organize elements |
| symbol | 1-3 letters which represent an element |
| periods (rows) | same as number of energy levels |
| columns (groups) | similar properties |
| atomic number | number of protons in the nucleus of each atom of an element; defines the element |
| three numbers that are always the same | protons electrons atomic number |
| isotopes | atoms of the same element with different numbers of neutrons |
| mass number | number of protons plus number of neutrons |
| atomic mass | weighted average mass of isotopes of an element unit is atomic unit (u) |
| metals | elements that are malleable, ductile, good conductors of electricity, and generally shiny (metallic luster) solids at room temperature |
| nonmetals | elements that are usually gasses or brittle and poor conductors of electricity and heat many solids of both many solids at room temperatures |
| metalloids | elements with characteristics of both metals and nonmetals; solids at room temperature |
Created by:
kisland17
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