Whose periodic table arranged the elements by increasing atomic weight and predicted missing elements?
Quick Answer
Dmitri Mendeleev’s. In 1869 he published a table that left gaps for undiscovered elements and predicted their properties.
The Full Story
Dmitri Mendeleev published his periodic table in 1869 and arranged the known elements largely by increasing atomic weight while grouping similar chemical properties. What made his work remarkable was that he left deliberate gaps where he believed undiscovered elements belonged. He also predicted the properties of elements such as gallium, scandium, and germanium before they were found. Later discoveries showed that the periodic law is better explained by atomic number, but Mendeleev’s table was a breakthrough in chemical organization.
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