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in a chemical reaction, atoms take part in order to get stabilized,i.e. atoms tend to have have half- filled orbitals or full- filled orbitals to attain stability,hence during a chemical reaction there is transfer of electrons from one atom to another,in order to attain stability,due to transfer of electrons ,an atom donating electrons from the last shell develops a positive charge whereas the atom accepting the donated electrons develops an equal and opposite i.e. negative charge,in order to keep the total charge of the system constant.As the atoms develop charges in the reaction process, these are called ions,those having positive charges are called cations whereas those having negative charges called anions

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Q: Why do atoms become ions during chemical reactions?
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