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Chemistry chapter 5

Terms in this set (88)

What did Mendeleev noticed?
that when the elements were arranged in order of increasing atomic mass, certain similarities in their chemical properties appeared at regular intervals.
Mendeleev created?
A table in which elements with similar properties were grouped together—a periodic table of the elements
Why did Mendeleev leave Several empty spaces?
Because he knew some elements were missing
Mendeleev predicted?
the existence and properties of elements that would fill three of the spaces... Now all three of these elements have been discovered
English scientist Henry Moseley discovered?
that the elements fit into patterns better when they were arranged according to atomic number, rather than atomic weight.
The Periodic Law
states that the physical and chemical properties of the elements are periodic functions of their atomic numbers.
The Periodic Table
is an arrangement of the elements in order of their atomic numbers so that elements with similar properties fall in the same column, or group.
Elements are arranged how is the periodic table?
vertically in the periodic table in groups that share similar chemical properties.
periods
Elements are also organized horizontally in rows
The length of each period is determined by..?
the number of electrons that can occupy the sublevels being filled in that period.
The periodic table is divided into...?
four blocks, the s, p, d, and f blocks.
The name of each block is determined by..?
the electron sublevel being filled in that block
alkali metals
The elements of Group 1 of the periodic table
In their pure state, all of the alkali metals are...?
a silvery appearance and are soft enough to cut with a knife.
alkaline-earth metals
The elements of Group 2 of the periodic table
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