Apr 7, 2014 - Periodic table - Wikipedia, the free encyclopedia. ... Periodic table - Wikipedia, the free encyclopedia Periodic Chart, Chemistry Posters, ... ... <看更多>

Video summary:The periodic table, also known as the periodic table of (the) (chemical) elements, is a tabular display of the chemical ... ... <看更多>

People have come to English Wikipedia over 1.1 million times since then to learn more. ... It is a member of the chalcogen group in the periodic table, ... ... <看更多>