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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 |