a) State Mendeleev's Periodic Law.
b) Why did Mendeleev leave gaps in his Periodic Table?
c) Give any one limitation of Mendeleev's Periodic classification.
a) The properties of elements are the periodic functions of their atomic masses.
b) In the classification of elements, Mendeleev was guided by two factors:
(i) Increasing atomic masses (ii) Grouping of similar elements
In order to make sure that the elements having similar properties fell in the same vertical column or group, he left some vacant places for elements which were yet to be discovered though he could predict their properties.
c) Hydrogen resembles alkali metals as well as halogens. So, a correct position could not be assigned to hydrogen in the periodic table.
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