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Live Science
14d
Periodic table of elements: How it works and who created it
When Mendeleev first published the original periodic table in 1869, it contained only 63 elements — about half as many as there are today. His table had gaps to leave room for elements that had ...
5mon
on MSN
118 Elements and Their Symbols and Atomic Numbers: Definition, Symbol with Atomic Number
The periodic table is a well-organized chart that contains all the known elements in the universe. These elements are ...
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