How were the elements of the periodic table discovered?
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elements of the periodic table discovered according to the atomic number
What is the basis of classification?
atomic mass at first
ND atomic number now
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on the basis of their chemical property
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mole concept
Mole can be defined as a unit which represents 6.023 x1023 particles of same matter. A mole(symbol mol) is defined as the amount of substance that contains as many atoms, molecules, ions, electrons or any other elementary entities as there are carbon atoms in exactly 12 gm of carbonaton
it's assumption
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