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Dmitri Mendeleev created the first Periodic Table according to Atomic Mass in 1869. Others before Mendeleev had organized the elements according to their properties and were able to discern periodicity, although Mendeleev is generally accepted as the creator of the table.

With the information he gathered about the elements, he was able to see that there were missing elements that hadn't been discovered. He could figure out the atomic masses of the missing elements by averaging the atomic masses of the elements above and below the missing one. One such element, which he called "eka-silicon" (eventually Ge) was missing, but with understanding of the patterns the periodic table made, he predicted the elements appearance, melting point, atomic mass, density, formula of oxide, and formula of chloride.

Throughout the years, other scientists were able to find or create these missing elements to form the table we know today. Today's periodic table is ordered by atomic number instead of atomic mass (as Mendeleev had started). Henry Moseley was the first to order the elements by atomic number so elements would fit together in groups/families and periods better in 1913.

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Related Questions

Is there a Le on the piriodic table?

No, there is no element with the symbol "Le" on the periodic table. The periodic table lists all known elements and their symbols, but "Le" is not one of them.


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What is a piriodic table?

A periodic table is a systematic arrangement of chemical elements, organized by increasing atomic number and grouped by similar properties. It provides essential information about each element, including its symbol, atomic number, and atomic mass. The table is divided into rows called periods and columns known as groups, which reflect the elements' periodic trends. This tool is fundamental in chemistry for understanding elemental behavior and interactions.


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George W. Kelley invented the steam table in 1897. Patent number 592,591.


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When was periodic table invented?

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