Q. 514.8( 9 Votes )
Noble gases could be placed in Mendeleev's Periodic Table without disturbing the original order.
According to Mendeleev’s classification, the properties of elements are the periodic function of their atomic masses and there is a periodic recurrence of elements with similar physical and chemical properties.
Noble gases were discovered much later after Mendeleev Periodic Table was discovered. Noble gases were placed in a separate group called Zero Group, after the 8th group. The placement of noble gases did not disturb the arrangement of any elements in the Mendeleev’s Periodic Table. Noble gases are present in very low concentration in the atmosphere and are chemically almost unreactive.
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