The atmospheric component that remains largely unreactive is _____________.
Argon
Earth's atmosphere is dominated by nitrogen (about 78%) and oxygen (about 21%), with argon at roughly 0.93%, carbon dioxide at about 0.04%, and only traces of gases such as methane, neon and helium. Among the listed gases, the one that remains largely unreactive is argon.
The reason lies in argon's electronic structure. Argon is a noble gas belonging to Group 18 of the periodic table, and it has a completely filled outer electron shell (its stable octet). Because its valence shell is already full, argon has almost no tendency to gain, lose or share electrons, so it does not readily form chemical bonds. Under ordinary atmospheric conditions it has no stable compounds and takes no part in atmospheric chemistry, which is exactly why it is described as inert.
By contrast, the other options are all chemically active in the atmosphere. Oxygen is highly reactive — it supports combustion, drives rusting (oxidation of metals) and is consumed in respiration. Carbon dioxide dissolves in water to form carbonic acid, is absorbed by plants in photosynthesis, and is a key greenhouse gas. Methane is a combustible hydrocarbon that is readily oxidised and is also a potent greenhouse gas. Only argon, with its full electron shell, stays essentially unreactive, making it the correct choice.
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