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Explain the ionic bond formation between calcium and sulphur?
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A $$Ca$$ atom has two valence electrons. It can achieve a noble gas configuration by losing these two electrons.
A sulphur atom has six valence electrons. It can achieve a noble gas configuration by gaining two electrons.
In the ionic bond formation between calcium and sulphur, a calcium donates two valence electrons to a sulphur atom to form a $$Ca^{2+}$$ ion and an $$S^{2-}$$ ion.
If $$Ca$$ gives two electrons to $$S$$, both ions have a noble gas configuration.
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