Group and period number of 1s^2
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Chemically, helium behaves like a noble gas, and thus is taken to be part of the group 18 elements. However, in terms of its nuclear structure it belongs to the s block, and is therefore sometimes classified as a group 2 element, or simultaneously both 2 and 18.
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Period 1.
Group 1 18
Atomic # Name 1 H 2 He
Explanation:
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