The common oxidation number of halogens is:
Correct answer: A. -1
- A. -1
- B. +1
- C. -2
- D. 0
Explanation
The most common oxidation state of halogens is -1. Halogens are the most electronegative elements of the periodic table. Their outer electron configuration is ns2, np5. If chlorine, for example, gains one more electron, the outer p orbitals are filled (resulting in a full octet). Since halogens are electronegative, they can easily remove an electron from nearby atoms to add to their valence p orbital achieving a full octet.
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Electrochemistry describes electron transfer through oxidation and reduction, identifies oxidizing and reducing agents, and applies oxidation numbers to balance redox equations. It also covers electrode potential and the standard hydrogen electrode, which provides the reference for comparing the reduction tendencies of other electrodes.
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