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list the noble gases that are obtained commercially by distillation of liquid air?

list the noble gases that are obtained commercially by distillation of liquid air?

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Neon, argon, krypton, and xenon. Except neon; argon, krypton, and xenon three of them are obtained by the fractional distillation of liquid air. But The lighter noble gas neon is obtained from air. Its boiling point (-246̊C) is too low for neon to condense during the liquefaction of air, and neon concentrates in the gas that remains after air is liquefied.

below is the percent composition of various gases present in our atmosphere.

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