Question

pls answer my question it is give reason with full explanation​

Answer 1

It is monatomic. Helium is a member of the noble gases which means it has a filled outer shell of electrons. With a full outer shell, it doesn't take part in most chemical reactions without a lot of forcing. ... Helium is a member of the noble gases which means it has a filled outer shell of electrons.

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Answer 2

Answer:

Monoatomic (monatomic): A molecule composed of just one atom, and lacking any covalent bonds. The noble gases (He, Ne, Ar, Kr, Xe, and Rn) are all monoatomic, whereas most other gases are at least diatomic.

(of an element) having or consisting of single atoms helium is a monatomic gas. (of a compound or molecule) having only one atom or group that can be replaced in a chemical reaction.

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. Two electrons in its outermost (and only) shell, two valence electrons.

Explanation: