An element has 1st shell fully filled and in 2nd shell has 6 electrons. Explain.

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Solution

The total number of electrons in the element is $2 + 6 = 8$ . So, the total number of protons is 8 and atomic number is 8.

Its last shell contains 6 electron but it can hold 8 electrons. So, that its valency is 2.

The element is oxygen.

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