Question

helium-valence electrons,group number,peroid number​

Answer 1

Explanation:

Helium is located in period 1, group 18 of the Periodic Table and has an atomic number equal to 2. As a result, neutral helium will only have 2 electrons surrounding its nucleus. Valence electrons are the electrons located in an atom's outermost shell. In helium's case, both its electrons will be valence electrons.

Answer 2

Answer:

Element: Helium

Symbol: He

Position: Helium is positioned at first place of right corner.

Valence electrons: Helium has 2 valence electrons ( the number of electrons in the outer most shell ).

Valency: 0. it is a noble gas and is stable with its two electrons.

Group number: Its group number is 18 .

Period number: Its period number is 1.

Electronic configuration: 2s²  ( or)

                                          K shell - 2

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