The frequency spectrum of an atom during gas discharge is considered the color "fingerprint" of that particular type of atom. For instance, true neon signs are always red because neon atoms themselves are red under gas discharge. Argon atoms are lavender under gas discharge, while sodium atoms are yellow and mercury atoms are blue.
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The frequency spectrum of an atom during gas discharge is considered the color "fingerprint" of that particular type of atom. For instance, true neon signs are always red because neon atoms themselves are red under gas discharge. Argon atoms are lavender under gas discharge, while sodium atoms are yellow and mercury atoms are blue.
The colours of the various atoms within the molecules follow the standard CPK rules: Hydrogen = White. Oxygen = Red.