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In an atom , L and M shells have the sam...

In an atom , L and M shells have the same number of electrons . N shell has one electron less than K shell . Explain the formation of compound by this element and oxygen atom.

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The electronic arrangement of the element could be 2, 8, 8, 1. It corresponds to Z = 19 and the element is potassium. Oxygen (Z = 8) has the electronic arrangement of 2, 6. Potassium loses one electron to form `K^(+)` ion, oxygen requires 2 electrons to complete its octet. Therefore, it takes 2 electrons from two potassium atoms and forms `K_2O`.
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