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which three elements having 7 electrons ...

which three elements having 7 electrons in their outermost shell?

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(i) Lithium (Li) (2,1) (ii) Sodium (Na) (2, 8 1) (iii) Potassium (K) (2 , 8,8 ,1).
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  • Which of the following have inert gases 2 electrons in the outermost shell ?

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    Ne
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