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Atomic Structure and the Periodic Table

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Term
Definition
Atom   The basic unit of matter  
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Nucleus   Center of atom containing protons and neutrons  
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Electron Cloud   Surrounds the Nucleus - contains electrons  
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Protons   Positively charged, found in the nucleus, contributes to mass and determines an elements identity.  
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Neutron   No charge, found in the nucleus, contributes to mass  
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Electron   Negative charge, orbits nucleus in electron cloud, Does Not Contribute to Mass  
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Atomic Mass   Protons + Neutrons  
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Atomic Number   The number of protons in the nucleus  
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CORES   all names for electron Energy levels, Cloud, Orbitals, Rings, Energy Levels, Shells  
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Valence Electrons   Outermost electrons found on the furthest orbital - determine reactivity - 2) 8) 8)  
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APE   Atomic Number = Proton Number = Electron Number  
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MAN   Mass Number - Atomic Number ----------------------- Neutron Number  
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amu   Atomic Mass Unit  
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Reactivity   How likely an atom is to bond  
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Periodic Table   Arrangement of elements according to atomic number  
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Group   Vertical alignment on the periodic table  
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Period   Horizontal alignment on the periodic table  
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Element   Pure substance made up of the same atoms  
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Compound   More than one element bonded  
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Element   A pure substance  
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