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A colourless, toxic gas with the characteristic odour of rotten eggs. It occurs in...
A polymorphic compound, mostly found in the form of quartz.
A colourless, heavier-than-air gas, an intermediate in the production of nitric acid.
One of the oxides of sulphur, forms sulphuric acid with water.
A colourless, odourless gas, an important component of the atmosphere, indispensable...
One of the hydrogen halides, it is used for the production of alkyl bromides.
A compound ion formed when a phosphoric acid molecule releases a proton.
A solid, grey substance which sublimates when heated. Its solution in alcohol is...