Chapter 5: Periodic Classifications of Elements

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Periodic Classifications of Elements

Question:

Besides gallium, which other elements have since been discovered that were left by Mendeleev in his periodic table?

Answer:

Mendeleev kept vacant places in the periodic table for elements not discovered till then. Three of these unknown elements were given the names eka-boron, eka-aluminium, and eka-silicon from the known neighbors. The ‘eka-aluminium’ stands for gallium, ‘eka-boron’ stands for scandium and ‘eka-silicon’ stands for germanium.


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