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Question
How do the properties of eka-aluminium element predicted by Mendeleev compare with the actual properties of gallium element?
Solution
The properties of eka-alumiunium, predicted by Mendeleev, which was undiscovered then, were almost similar to the actual properties of the element discovered later on. The comparison table below shows the similarities in the properties of the undiscovered element then and the actual element (Gallium).
| Property | Eka-Aluminium | Gallium |
| Atomic Mass | 68 | 69.7 |
| Density | 5.9g/cm3 | 5.94g/cm3 |
| Melting point | low | 30.2oC (low) |
| Formula of oxide | Ea2O3 | Ga2O3 |
| Formula of chloride | EaCl3 | GaCl3 |
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RELATED QUESTIONS
What was the Mendeleev's basis for the classification of elements?
The three elements predicted by Mendeleev from the gaps in his periodic table were known as eka-boron, eka-aluminimum and eka-silicon. What names were given to these elements when they were discovered later on?
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