The atomic number of an element is 8. Its valency is:

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Atomic number 8 is oxygen (2,6). It needs 2 more electrons to complete octet, so it gains 2 or shares 2 electrons. Its valency is 2 (typically). It can form two covalent bonds. In H₂O, oxygen forms two bonds.

The atomic number of an element is 8. Its valency is: MCQ with Answer and Explanation

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