Answered

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Which of the following is not a characteristic of a noble gas?
They exist in nature as single atoms.
They always have fewer than 8 valence electrons.
They follow either the duet rule or the octet rule.
They are not very reactive.

Sagot :

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Final answer:

Noble gases are inert and unreactive elements that have full octet configurations, except for helium, which follows the duet rule. They exist as single atoms and have 8 valence electrons, making them very stable.


Explanation:

Noble gases have the most stable configuration with a full octet, making them very inert and unreactive compared to other elements. They follow the octet rule, except for helium, which adheres to the duet rule as it aims for 2 valence electrons. These gases typically exist as individual atoms and have 8 valence electrons.


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