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Atomic theory Pt.2

this is about atoms

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
Created by: cl61942