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Sodium belongs to alkali group with one electron that too s electron in its outermost orbit. As the atomic number ie the door number for sodium is 11 it has one free electron. Hence the valency of sodium is taken to be one. As this electron can be easily taken out of the atom, the atom becomes positive ion. Hence sodium gives one electron to chlorine atom as chlorine needs one electron to attain noble level. Hence ionic bond gets formed between these two elements and thus NaCl compound is formed, which is the salt that we use daily unavoidably.

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Which atom will form an ion sodium or oxygen?

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