Pe•ri•od•ic ta•ble
/ˌpirēˌädik ˈtāb(ə)l/
noun [chemistry]
a table of the chemical elements arranged in order of atomic number, usually in rows, so that elements with similar atomic structure (and hence similar chemical properties) appear in vertical columns.
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História de la tabla periodica
Octet Rule
Selenium was a normal element, but always seemed to be missing something. As she had not yet found an element...
