Question

What is the electron configuration of the oxide ion (o2–)? A. 1s 2 3s 2 5p 6 B. 1s 2 2s 2 2p 6 C. 6s 2 2s 5 2p 6

Answer 1

The electron configuration of the oxide ion (O2–) is 1s²2s²2p⁶. This configuration is also identical to the electron configuration of the noble gas neon, which is stable.

Step-by-step explanation:

The electron configuration of the oxide ion (O2–) is 1s²2s²2p⁶.

Oxygen has six valence electrons in the second energy level, represented by the configuration 2s²2p⁴. When it gains two electrons to become the oxide ion, it fills the p sublevel completely with a total of six electrons, resulting in the configuration 1s²2s²2p⁶.

This configuration is also identical to the electron configuration of the noble gas neon, which is stable.