On 17 February 1869, Russian chemist Dmitri ... Soon, Mendeleev was predicting the properties of three elements – gallium, scandium and germanium – that had not then been discovered.
The modern periodic table, arranged in rows and columns, was first introduced by Dmitri ... but Mendeleev predicted that additional, yet-undiscovered elements would eventually fill the gaps. His ...
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20 Years of Discovery: How Has the Periodic Table Changed Over Time?1 Image Credit: New Africa/Shutterstock.com The modern periodic table, arranged in rows and columns, was first introduced by Dmitri Mendeleev ... as newly discovered elements were gradually ...
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