achievements of Mendeleev periodic table????
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(a) The achievements of Mendeleev's periodic table were:
Mendeleev kept some blank spaces in the periodic table for the elements that were yet to be discovered.
Predicted element
Actual element discovered later
Eka-boron
Scandium
Eka-aluminium
Gallium
Eka-silicon
Germanium
He also predicted properties of some elements even before their discovery and were later found to be correct.
Property
Eka-aluminium
Gallium
Atomic mass
68
69.7
Formula of oxide
E2O3
Ga2O3
Formula of chloride
ECl3
GaCl3
Mendeleev’s periodic table could accommodate noble gases when they were discovered
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