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Ch. 20 Elements and Their Properties CP
AB
Valence electrons# of electrons in theouter energy level
Ionization Energyamount of energy needed to remove an electron from an atom (left to right it increases)
Atomic sizedecreases from left to right; increases from top to bottom
Alkali Metalsgroup 1 elements; most reactive
Alkaline Earth Metalsgroup 2 elements
Transition Elementsgroups 3-12
Lanthanide seriesatomic numbers 58-71
Actinide seriesatomic numbers 90-103
Transuranium elementsradioactive elements with atomic numbers greater than that of uranium (#92)
Halogensgroup 17 elements
Noble Gasesgroup 18 elements
Boron Familygroup 13 elements
Carbon Familygroup 14 elements
Nitrogen Familygroup 15 elements
Oxygen Familygroup 16
Mrs. Gordy

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