12 terms

The Periodic Table

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Dmitri Mendeleev
Russian chemist who discovered a repeating pattern to the elements in 1869, which came to be called the periodic table of the elements
Periodic Law
Law that says the repeating properties of elements change periodically as the atomic numbers change
Periodic Table
Table that arranges the elements according to their atomic numbers so that elements with similar properties are in the same column
Group/ Family
In the Periodic Table, the vertical columns of elements that have similar properties
Period
Horizontal row of elements in the Periodic Table listed in order by atomic number which increases from left to right
Alkali metals
The elements of Group One on the Periodic Table and are the most reactive, easily forming compounds with other elements
Alkaline-earth metals
The elements of Group Two on the Periodic Table that are less reactive than alkali metals
Transition metals
The elements of Groups 3 - 12 on the Periodic Table that are less reactive than the other metals
Lanthanides
Transition metals from Period 6 that appear in the 1st row under the table; They are typically shiny, reactive metals, some of which are used to make steel.
Actinides
Transition metals from Period 7 that appear in the 2nd row under the table; They are typically radioactive and unstable; Those after 94 do not occur in nature
Halogens
The very reactive nonmetals in Group 17 that combine readily with other atoms, especially metals
Noble gases
The un-reactive nonmetals in group 18 of the Periodic Table
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