When Dmitrii Mendeleev proposed his periodic table more than 150 years ago, no one knew what was inside an atom. PeriodicTableDay
. Mercury discovered in the ground in Lolo, Mont., nearly two centuries later clued experts in to the location of one of the explorers’ campsites.Mendeleev left blank spaces in his original periodic table so that he could properly line up the known elements. Gallium, element 31, was his first gap to be filled, in 1875. The star of a popular chemistry trick, the metal gallium is solid at room temperature but liquid above 29.7° Celsius.
. The few atoms of oganesson that chemists have made survived for less than a millisecond. Scientists continue smashing atoms together in the lab in search of elements beyond 118.
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