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Filling of Electrons for Elements

Which of the ...

Question

Which of the following electronic configuration represents a noble gas?

A

2,8,2

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B

2, 8, 6

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C

2

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D

2, 8, 8, 2

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Solution

The correct option is C
2

Since, noble gases have stable elecetronic configuration, thats their octet or duplet(in case of helium) of electrons is complete.

Therefore,2 is the electronic configuration of Helium which is a noble gas.

Atomic number of helium = 2

Therefore number of electrons = 2

Therefore, electronic configuration of helium is 2.(K shell)

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