1. Groups of Elements

2. Group 1: Alkali Metals 1 – valence electron (+) positive 1 ion Found in nature as compounds Obtained from reduction of fused salts Group 1 (X) + Group 17 (Y) = XY Group 1 (X) + Oxide (O) = X 2 O Low electronegativity Low ionization energy

3. Group 2: Alkali Earth Metals 2 – valence electron (+) positive 2 ion Found in nature as compounds Obtained from reduction of fused salts Group 2 (M) + Group 17 (Y) = MY 2 Group 2 (M) + Oxide (O) = MO Radioactive

4. Group 3-12 Transition Metals Properties vary Tend to form multiple positive oxidation numbers Form colorful compounds

5. Group 17: Halogens 7 – valence electron (-) negative 1 ion Exist in all three phases Exist as diatomic elements Obtained from fused salt Group 1 (X) + Group 17 (Y) = XY Group 2 (M) + Group 17 (Y) = MY 2 High electronegativity High ionization energy

6. Group 18: Noble Gasses 8 – valence electron [He has 2] Does not gain or lose electrons All are gases Nonreactive Very stable Only Argon and Xenon can produce compounds with Fluorine