⚙️ how
How did Dmitri Mendeleev predict missing elements?
ChemistryHistory of Science
Quick Answer
In 1869, Mendeleev left gaps in his periodic table when no known element fit a pattern. He predicted the properties of several undiscovered elements, including gallium and germanium.
The Full Story
Dmitri Mendeleev published his periodic table in 1869 and noticed that chemical properties repeated in a pattern. When no known element fit a spot, he left a gap rather than forcing the table to be complete. He predicted the masses and properties of elements such as eka-aluminum, later discovered as gallium in 1875, and eka-silicon, later discovered as germanium in 1886. Those successful predictions helped prove the power of the periodic law.
Key Facts
1.Mendeleev’s table was published in 1869
2.Gallium was discovered in 1875
3.Germanium was discovered in 1886
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"He predicted elements decades before anyone found them"