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38 Cards in this Set
- Front
- Back
1869, Russian,arranged the elements in order of increasing atomic mass; started to be a pattern
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mendeleev
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happen at regular intervals
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periodic
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1914, reorganized the periodic table into increasing atomic number
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moseley
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metals
nonmetals metalloids |
3 classification groups of elements
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drawn into thin long wires
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ductile
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can be pounded ino thin sheets
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malleable
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found to the left of the zig zag line
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metals
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atoms of most _____ have few electrons in their energy level
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metals
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shiny, ductile, malleable, and good conductors of electrical current and thermal energy
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metals
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found to the right of the zig zag line
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nonmetals
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has almost a complete set of electrons in their outer energy level
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nonmetals
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aren't shiny, ductile, malleable; brittle solids; poor conductors of electrical currents
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nonmetals
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elements that border the zig zag line
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metalloids
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atoms of ____ have about 1/2 of a complete set of electons in their outer energy level
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metalloids
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have some properties of metals and nonmetals
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metalloids
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semiconductors
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metalloids
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each ___ is identified by a chemical symbol
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element
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each square on the table contains _____, ______, _____, and _____
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element name, symbol, atomic#, and atomic mass
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for most elements they have __ or __ letters in their symbol
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1 or 2
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newer elements have __ letters
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3
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rows that follow a repeating pattern of chemical and physical properties as you move across the row
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periods
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elements in the same _____ often have similar chemical and physical properties
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group
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metals
1 electron in outer level very reactive softness, color of silver, shininess, low density |
Group 1: Alkali Metals
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metals
2 electrons in outer level very reactive, but less reactive than Alkali metals color of silver, higher denstities than alkali metals |
Group 2: Alkali-Earth Metals
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all metals
1 or 2 electrons in outer level less reactive than group 2 shininess, good conductors of electrical current and thermal energy |
Group 3-12: Transition Metals
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Periods 6 and 7 always in 2 rows at the bottom
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Lanthanides and Actinides
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1 metalloid and 4 metals
3 electrons in outer level reactive solids at room temp. |
Group 13: Boron Group
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1 nonmetal, 2 metals, 2 metalloids
4 electrons in outer level reactivity varies solids at room temp. |
Group 14: Carbon Group
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2 nonmetals, 2 metalloids, 1 metal
5 electrons in outer level reactivity varies solids at room temp. (except for nitrogen) |
Group 15: Nitrogen Group
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3 nonmetals, 1 metalloid, 1 metal
6 electrons in outer level reactive solids at room temp. (except for oxygen) |
Group 16: Oxygen Group
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nonmetals
7 electrons in outer level very reactive poor conductors of electrical current; violent reactions with alkali metals to form salts; never uncombined in nature |
Group 17: Halogens
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nonmetals
8 electrons in outer energy level(except helium 2 electrons) unreactive colorless, odorless, gases at room temp. |
Group 18: Noble Gases
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nonmetal
1 electron in outer level reactive colorless, odorless gas at room temp., low density |
hydrogen
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a pure substance that cannot be broken down into another substance
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element
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a pure substance made from one or more elements
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compound
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using electricity to break apart a compound
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electrolysis
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substance that speeds up a chemical reaction but is not changed
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catalyst
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compounds containing oxygen
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oxides
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