They already have eight valence electrons in their outer shell Which means the outer layer is full.
Noble gases are also known as inert gases because it takes extreme conditions for them to react with any other element, including themselves.
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An atom in a ground state with 8 valence electrons is likely to be an oxygen atom. Oxygen has 6 electrons in the outermost shell, also known as the valence shell, along with 2 electrons in the inner shell. This configuration allows oxygen to easily form chemical bonds with other atoms to achieve a more stable electron configuration.
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The group that argon belongs to is the Noble Gases, otherwise known as the inert gases. However, Noble gases is the more acceptable term nowadays because the description inert implies that they cannot be reacted with. These Noble Gases such as argon can be reacted with, but they need incredibly extreme conditions to do such.
Noble gases are those which are colorless, odorless, tasteless, and non-flammable. Their name comes from the fact that they were initially believed to never bond with other atoms which was later disproved.
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Yes, they have stable electron configuration i.e, their outer most shell has all its valence electrons filled.Some famous noble gases areHelium (He)Neon (Ne),Argon (Ar),Krypton (Kr),Xenon (Xe),and the radioactive Radon (Rn).
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Alkali metals have a single electron in their outermost energy level (valence shell), which makes them highly reactive as they tend to lose that electron easily to achieve a stable electron configuration. In contrast, noble gases have full outer electron shells, meaning their valence levels are completely filled with electrons, making them stable and mostly unreactive. This fundamental difference in electron arrangement is the reason behind the contrasting chemical properties of these two groups in the periodic table.