Concept:Rare gases are stable because their outermost electron shell is completely filled, giving them an octet structure.
Explanation:Rare gases, also called noble gases, have a full valence shell.
Most of them contain
8 electrons in their outermost shell, which is known as an octet.
Helium (
He) is an exception, as it is stable with only
2 electrons in its single shell.
This fully filled configuration means there is no tendency to lose, gain, or share electrons.
As a result, rare gases are chemically unreactive and do not easily form compounds.
Having an equal number of protons and neutrons, or more electrons than protons, does not explain their chemical stability.
Rare gases are not chemically active; they are inert.
Therefore, the reason for their stability is the presence of a complete octet in their outermost energy level.
Answer:D. have octet structure