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Q.

Which of the following element is not a group 18 element of the periodic table?

 A.

Neon 

 B.

Copper

 C.

Xenon

 D.

Helium

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Solution:
Option(B) is correct

Copper does not belong to the group 18 of the periodic table.

Inert gas or noble gas, any of the elements in Group 18 of the periodic table. In order of increasing atomic number they are: helium, neon, argon, krypton, xenon, and radon.


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