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2016-03-06T09:34:48+05:30

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Because k shells maximum eletron is 2...
2 3 2
becozz it is stable
ya...itz stable...
2016-03-06T09:36:41+05:30

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Certified answers contain reliable, trustworthy information vouched for by a hand-picked team of experts. Brainly has millions of high quality answers, all of them carefully moderated by our most trusted community members, but certified answers are the finest of the finest.
Since electrons of helium are present in 1s orbital, the orbital gets filled with the two electrons. Such that the first orbit is filled because it's maximum revolving orbital around it is 1 with 2 electrons. Due to it's stability power and completely filled orbit, helium has no valency.
3 3 3