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15 Cards in this Set
- Front
- Back
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Stanislao Cannizzarro
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•Presented a convincing method for accurately measuring the mass of an atom.
•Enabled chemists to agree on standard values for atomic mass and initiated a search for relationships between atomic mass and other properties. |
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Groups (Families)
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vertical columns, numbered horizontally 1 to 18
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Periods (Series)
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horizontal rows, numbered vertically 1 to 7
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Dobereiner (Germany)
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•sets of 3 elements known as triads
•properties of element #2 in the set approximately halfway between element #1 and element #3 |
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Newlands (England)
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•repeating pattern in sets of 8 elements ---- law of octaves
•element #1 like element #8 ---- like notes on a musical scale •too many missing elements to seriously consider |
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Meyer (Germany)
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•repeating pattern for all known elements using increasing atomic mass
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Mendeleev (Russia)
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•first person to put all known elements into one table
•used increasing atomic mass to start •left empty spaces throughout the table •predicted the properties of unknown elements •changed the order of the elements based on their properties •discovered the periodic law, but didn't know it at the time |
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Moseley (England)
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•used x-rays to determine bright line spectra
•elements in order of increasing atomic mass •discovered the modern periodic law |
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Ramsey (Scotland)
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•discovered the noble gasses
•added a new group to the periodic table |
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3 sets added to original periodic table
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•lanthanides
•actinides •noble gasses |
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Alchemy
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a pseudoscience that contributed to the development of modern chemistry and medicine
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Alchemists
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•believed in the 4 elements and the mythical substance phlogiston
•air, fire, earth, water |
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Goals of Alchemists
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•transmutation of base metals into gold (European)
•creation of the elixir of life (Chinese) •discovery of a universal solvent |
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Robert Boyle
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•father of modern chemistry
•wrote the textbook "the skeptical chymist" •attacked alchemy for its lack of accurate and precise measurement of chemicals |
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S Block
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groups 1 & 2
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