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  Acid radical is the anion or negative ion in the salt which has come from the "parent" acid 
eg. SO4^2- sulphate from sulphuric acid H2SO4 
Cl^- chloride from hydrochloric acid HCl 

Basic radical is the cation or positive ion from the "parent" base/alkali (most often a metal ion) 
eg. Na^+ sodium, Cu^2+ copper, Al^3+ aluminium 
NH4^+ ammonium..

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A radical formed by the removal of hydrogen ions from an acid is called acid radicals.
Anions are atoms or groups of atoms that have gained electrons. Having more negatively charged electrons than positively charged protons, they are negatively charged.
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