On 17 February 1869, Russian chemist Dmitri Mendeleev jotted down the symbols for the chemical elements, putting them in order according to their atomic weights and inventing the periodic table.

The modern periodic table, arranged in rows and columns, was first introduced by Dmitri Mendeleev in 1869. At the time, it included the known elements and their properties, but Mendeleev predicted ...

If so, you’ll be in good shape.) If you’ve played Connections: Sports Edition, our daily game that’s expanding, this quiz should feel like a different exercise for those same synapses you ...

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