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28 Cards in this Set
- Front
- Back
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when elements are arranged in order of increasing atomic #, chemical and physical properties show a repeating pattern.
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periodic table
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Dobereiner
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sets of three elements
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J.A.R Newlands
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law of octaves
patern repeated every 8 elements |
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Mendelev and Meyer
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elements in same column same properties.
increasing atomic mass |
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moseley
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icreasing atomic number
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vertical columns
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groups or families
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horizontal rows
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periods
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left of the stairstep line
shiny good conductors of heat and electricity most are solids at room temp ductile and malleable |
metals
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right of stair-stepline and hydrogen
some gases are solids at room temp poor conductors,not malleable |
non metals
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directly above or below stairstep
exceptions = |
metalloids or semimetals
- aluminum and pottasium |
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characteristics of metals
very reactive and especially with air and water low densities and melting points [sodium] |
alkali metals
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alkali metals
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group 1
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higher densities and melting points
less reactive |
alkaline earth metals
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alkaline earth metals
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group 2
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many have colorful compounds
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transition elements
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transition elements
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group 3-12
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"salt former"
very reactive with most metals and nonmetals all diatomic |
halogens
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halogens
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group 17
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not very reactive
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noble gases
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noble gases
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group 18
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focuses on valence electrons
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abbreviated electron configurations
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electrons in the outermost energy level
same group |
valence electrons
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properties of the elements that can be predicted by their arrangement on their periodic table
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periodic trends
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distance from the center of the nucleus to the outermost electrons
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atomic size[radius]
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to find the ________
across -> decreases increase is down |
atomic size[radius]
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amount of energy needed to remove an atoms electron
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Ionization energy
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kj/mol
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ionization energy
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to find the ________
increases -> decreases when you go down |
ionization energy
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