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Mendeleev and the Periodic Table Evolution by Hazel Valenzuela is a document available to read on EtoBox.
John Newlands and Dmitri Mendeleev noticed periodic patterns in the properties of elements when they were arranged in order of atomic mass. Mendeleev created the first periodic table in 1869, which grouped elements into columns based on similar properties. Later, Henry Moseley discovered that elements should be arranged by atomic number instead of atomic mass. The modern periodic table is organized into blocks and groups based on the electron configurations of elements.
- Author
- Hazel Valenzuela
- Language
- EN