what is meant by 'HA' in modern perodic table...
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Where u found HA there's no HA in modern periodic table instead there are Hf and Hg, which are Hafnium and mercury respectively.
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it could possibly the heading of group 17 elements by name HA, HALOGENS. these are chlorine, bromine, astatite etc.
or the halide Hydrogen Astatide : HAt perhaps
or the halide Hydrogen Astatide : HAt perhaps
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