SSC MTS EXAM

Detailed explanation-1: -Oxygen has an electron arrangement of (2, 6) and needs to gain two electrons to fill the n=2 energy level and achieve an octet of electrons in the outermost shell. The oxide ion will have a charge of 2− as a result of gaining two electrons.

Detailed explanation-2: -For example, we know that Oxygen always forms 2-ions when it makes an ion. This would add 2 electrons to its normal configuration making the new configuration: O2-1s22s22p6. With 10 electrons you should note that oxygen’s electron configuration is now exactly the same as Neon’s.