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Atomic Theory P2
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| Question | Answer |
|---|---|
| Valence electrons | The electrons farthest from the nucleus ; they are responsible for atoms forming compounds |
| Molecule | 2 or more atoms chemically combined |
| Compound | 2 different atoms chemically combined |
| Mixture | A combination of 2 or more different atoms or molecules that are not chemically combined |
| Covalent bond | Chemical bond between 2 nonmetals |
| Ionic bond | Chemical bond between a metal and a nonmetal |
| Octet rule | Elements are stable when their valence shell is full. This can be done with 8 or in some cases 2. |
| Alkali metals | Float on water, 1 valence electrons |
| Alkali earth metals | High melting points, good conductors, 2 valence electrons |
| Transition | To make tools, 3 valence electrons |
| Halogens | Most toxic, 7 valence electrons |
| Inert gases | Don't form compounds, 8 valence electrons |