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Atomic theory Pt.2
this is about atoms
Term | Definition |
---|---|
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 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 | Very reactive and have 1 valence eletron |
Alkali earth metals | Only react with halogens and have 2 valence electrons |
Transition metals | Can conduct electricity and cannot mix with other elements |
Halogens | Very electro negative and have 7 valence electrons |
Noble gasses | stable and unreactive and all have 8 valence electrons |