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Helium is not an element of the group 2 in the periodic table. Group 2 is the berilium's group. Helium is a noble has and his group is 18. Last level structure electronic of hydrogen and helium are exceptions on the periodic table. The position of this elements it's a compromise between last level electronic structure and chemical behaviour. In the case of hydrogen the solution adopted is to include it in the alcalin Group, it is Group 1. Helium's position considered more important his chemical behaviour as a noble has and then is placed in Group 18, although his electronic structure is 1s2, more accurate for element of Group 2.
How many valence electrons does helium have?