The noble gases are unreactive and stable. Which of the following explains why this is true? They have 8 electrons in their outer shell (except for Helium).
They exist on their own without other elements.
They have more electrons than other elements.
They each have no electrons.

EXPLAIN

The answer is A. They have 8 electrons in their outer shell (except for Helium).

Explanation: This is because of the number of valence electrons( the amount of electrons in their outer shell). For a reaction to take place, a transfer of electrons must take place. If their outer shell is already full, they don't have any tendencies to react.

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