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If the next heaviest element did not fit the chemical properties of the column, Mendeleev skipped a box and moved it to the column where it did fit.

The single most defining feature of Dmitri Mendeleev's original periodic table was his decision to and use them to predict undiscovered elements . 🚀 How the Feature Worked gthbjlbxtcrfz nf

He assumed the empty spaces belonged to elements that humans had simply not discovered yet. 🔮 The Famous Predictions If the next heaviest element did not fit

Other scientists forced elements into rigid grids even when the properties did not match. 🔮 The Famous Predictions Other scientists forced elements

Mendeleev used the elements above his empty gaps to calculate and predict the exact physical and chemical properties of the missing elements: →right arrow Discovered 4 years later as Gallium "Eka-boron" →right arrow Discovered 10 years later as Scandium "Eka-silicon" →right arrow Discovered 17 years later as Germanium