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Modern Periodic Table

IN MENDELEVEE...

Question

IN MENDELEVEES PERIODIC TABLE,WHY WAS THERE NO MENTION OF NOBLE GAS LIKE HELIUM,NEON,AND ARGON.

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Solution

When Mendeleev proposed his periodic table, no noble gas was known at that time. These gases were discovered later and hence are not a part of Mandeleev's periodic table.

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(b) What were the two criteria used by Mendeleev to classify the elements in his periodic table?
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