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Java Games: Flashcards, matching, concentration, and word search. |
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| A | B |
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| Lavoisier | classified elements as metal, nonmetal, gas, earth |
| Dobereiner | found Triads |
| Triads | groups of three elemets with similar properties |
| Newlands | Law of Octaves |
| Law of Octaves | in mass order properties repeat every 8 elements |
| Mendeleev | periodic table based on atomic masses |
| Moseley | periodic table based on atomic number |
| period | row in table of elements corresponds to energy leve |
| group / family | column in table of elements have similar electron configurations |
| atomic mass | weighted average of element's isotopes distribution in nature |
| atomic mass unit | one twelfth the mass of carbon-12 atom |
| metals | majority of elements; found on left of table |
| nonmetals | fewer elements; found on right of table |
| metalloids | found on "stairs" between metals and nonmetals |
| valance electrons | electrons in highest occupied energy level of an atom |
| alkali metals | Li, Na, K, Rb, Cs, Fr |
| alkaline earth metals | Be, Mg, Ca, Sr, Ba, Ra |
| boron family | B, Al, Ga, In, Tl |
| carbon family | C, Si, Ge, Sn, Pb |
| nitrogen family | N, P, As, Sb, Bi |
| oxygen family | O, S, Se, Te, Po |
| halogens | F, Cl, Br, I, At |
| noble gases | He, Ne, Ar, Kr, Xe, Rn |
| 8 valance electrons | Group 8A (18) |
| 7 valance electrons | Group 7A (17) |
| 6 valance electrons | Group 6A (16) |
| 5 valance electrons | Group 5A (15) |
| 4 valance electrons | Group 4A (14) |
| 3 valance electrons | Group 3A (13) |
| 2 valance electrons | Group 2A (2) |
| 1 valance electron | Group 1A (1) |
| transition metals | Groups 1B-8B (3-12) |
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Science Instructor |
| Scarsdale, NY |
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