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chem 5

Terms in this set (48)

s. cannizzaro
italian, developed a method that led to the determination of standard relative atomic masses
Dmitri Mendeleev
published a periodic table based on the chemical properties and arranged generally according to atomic masses
atomic mass
what property did mendeleev use to arrange the elements in his table
chemical properties
what kinds of properties did mendeleev use to group the elements in his table
groups go across rather than up and down, not as many elements, commas instead of decimal points
what are some differences between Mendeleev's table and the modern periodic table
scandium, gallium, and germanium
three elements whose existence and properties mendeleev predicted
mendeleev
father of the periodic table
periodic law
besides the periodic table what else is mendeleev credited for
moseley
did x-ray experiments that showed elements fit into patterns better when ordered by increasing nuclear charge
noble gases
difficult to discover because very unreactive; all placed in a group of their own (group 18)
lanthanides
difficult to separate and identify these because they all have such similar chemical and physical properties, first row of f-block, elements 68-71; sixth period
actinides
second row of f-block, elements 90-103; seventh period
longer
periods get ____________ every couple of periods
electrons
the length of each period is determined by the number of ________________ that can occupy the sublevels being filled in the elements of that period
S- block
2 elements wide, groups 1-2
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