Question

where is placed noble gas in Mendeleev tables?

Answer 1

All of the elements in Mendeleev's original periodic table were known either from observation (e.g. gold) or reactions with other elements.

Answer 2

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MENDELEEV 'S PERIODIC TABLE COULD ACCOMMODATE NOBLE GASES WHEN THEY ARE DISCOVERED.

WHEN A WHOLE NEW OF ELEMENTS CALLED NOBLE GASES WAS DISCOVERED ,IT GOT A PLACE IN THE TABLE INTHE FORM A SEPARATE GROUP .IT DID NOT DISTURB THE ORIGINAL ARRANGEMENT OF MENDELEEV 'S PERIODIC TABLE .THE NOBLE GASES ARE PLACED IN A SEPARATE GROUP BECAUSE THEY ARE UNREACTIVE (OR INERT) AND PRESENT IN EXTREMELY LOW CONCENTRATION IN ATMOSPHERE.

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