why was the position of hydra not fixed in Mendeleev periodic table
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firstly it is not hydra it is hydrogen . just read it . hope that will help
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Like alkali metals, hydrogen combines with halogens, oxygen and sulphur to form compounds having similar formulae.
Eg. Compounds of H: HCL, H2O, H2S
Compounds of Na: NaCl, Na2O, Na2S
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