Question

Give Reason:1.Helium is chemically extremely unreactive.
2. The shells surrounding the nucleus of an atom are also called 'energy levels'

Thank you.
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Answer 1

Explanation:

1.helium is chemically extremely uncreative because it have stable electronic configuration and is a noble gas. so it does not react with other elements easily.

2.an electron revolving in a cell is associated with definite amount of energy thus a shell also gives energy to electron besides it's location and are therefore called energy levels.

Answer 2

Answer:Helium is one of noble gases in group 8 of the Periodic Table. All these have a full outer electron shell. ... The proton number of helium is two, so a helium atom has two electrons, which exist in the 1s shell. It doesn't to gain or lose electrons to fill thus shell and is unreactive.

2)Helium is unreactive because it has a closed-shell electron configuration. Since it's completely full, it's not happy with sharing or ceding electrons.

Explanation:

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