an element a reacts with oxygen to form an ionic compound and the electronic configuration of 2,8,8,2 to show the bond formation of the compound formed when m is made to combine with chlorine
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By seeing the electronic configuration, we can easily say that it is calcium.
It reacts with oxygen to form ionic compound, Cao. It is more electropositive element.
When the same element rects with chlorine it forms ionic compond CaCl2. because, when you have any two atoms of high difference in electronegativities you get ionic bond.
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