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Cards In This Set
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Contribution of Stanislao Cannizzaro
Italian Chemist |
credited with showing consistent atomic weights.
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Contribution of Mendeleev, Russian Chemist
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Presented periodic table of elements based on increasing atomic weight - 3/6/1869. using the table, he predicted proerties of elements that had not been discovered yet.
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contribution of Mosley, English Physist
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used X-Ray to study atomic structure. Reorganized the Periodic Table using closer determination of atomic numbers. Arranged by increasing atomic numbers.
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Mendeleev arranged the PT according to increasing
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atomic weight/atomic mass
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Mosley arranged the PT according to increasing
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Atomic numbers - a more accurate positioning.
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Number of Groups and Periods in the Periodic Table
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7 horizontal rows of elements called Periods. Vertical columns are called groups - there are 18 groups or families.
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What are the 4 sub-levels? Where are they locaetd on the PT? sublevels also called blocks.
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S= two tall columns on the left. (with helium)
p = six tall columns on the right, without helium d - 10 short columns in the middle of the table f - the 14 columns of two below the main body fo the table |
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What are the names of the elements for Groups
1, 2, 17 & 18? |
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What are the elements 58-71 called?
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Lanthanides
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What are the elements 90 - 103 called?
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Actinides
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Which group is the most reactive metals and the most reactive non-metals?
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Group 1, Alkali metals are most reactive.
Group 17 - halogens, non-reactive |
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Which group is called inert gases?
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Group 18, also called noble gases
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Where in the PT are the man-made elements and radio active elements located?
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Know examples of naturally occurring radioactive elements.
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Rubidium, thorium, uranium (3), potassium, iodine, technetium, plutonium, carbon, radium, radon, polonium, calcium, argon
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What are the 7 elements ont he PT staircase?
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Metaloids - distinguish metals from non-metals.. boron, silicon, germanium, arsenic, antimony, tellurium, polonium.
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