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What is the Color of the OH atom?



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There is no such thing as an "OH atom". OH- exists as a negative ion that can form crystalline structures with positive metal ions such as Li+ solutions of which are alkaline. The colour of these compounds depends on the metal, group 1 and 2 metals, to which OH usually coordinates are generally colourless. D block metals tend to form coloured compounds due to splitting in d-orbitals.