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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 direct translation of your prompt from a Russian keyboard layout is , which translates to "Periodic table — produce a feature." 🔬 The Periodic Table: The Predictive Power of Gaps gthbjlbxtcrfz nf

Other scientists forced elements into rigid grids even when the properties did not match. If the next heaviest element did not fit

He assumed the empty spaces belonged to elements that humans had simply not discovered yet. 🔮 The Famous Predictions 🔮 The Famous Predictions Mendeleev used the 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

How the differs from Mendeleev's original version The biography of Mendeleev himself Periodic Table of Elements - American Chemical Society