Question

Give reason why noble gases are placed in separate group in modem periodic table. [Foreign 2013]

Answer 1

Answer:

Noble gases are placed in separate group because their valence shell is totally filled and thus they all are stable and don't take part in chemical reactions.

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Answer 2

Answer:

AT FIRST I WANT TO STATE YOU THAT NOBLE GASES WAS FOUND MUCH LATER THAN MANY ELEMENTS. BEFORE THE DISCOVERY OG NOBLE GASES MANDEELEVE PERIODIC TABLE WAS MUCH FAMOUS,

SO FAMOUS THAT NOBLE GASES WAS GIVEN A SEPARATE GROUP.

ANOTHER POINT IS THAT HIS LATER PERIODIC TABLE WAS BASED ON ATOMIC NUMBER.

ALSO NOBLE GASES WERE USUALLY NON-REACTIVE