Oxidation Number

[Vanessa_Ong_3F]

Why does Cl- have an oxidation number of -1?

[Natalie Keung 1D]

Cl has an oxidation number of -1 because it gains one electron to complete its octet when becoming an ion or bonding with another ion.

[Barbara Soliman 1G]

The oxidation number is the charge of an atom when it is bonded in a molecule. I am not quite sure what example you are pulling this out of, but my guess is that since Cl has a charge of -1, that is its oxidation number. Hope this helps!

[Jillian Sarquiz- 2B]

Cl has 7 electrons and needs to gain one more to have an octet

[Sevde Coban 2J]

Cl has an oxidation number of -1 because Cl has 7 valence electrons and needs to gain one more electron with a charge of -1 to have a full valence shell.

[Jayden Tan 2L]

The oxidation number of Cl is -1 because it requires one more electron in order to complete it's octet!! The pattern then goes on when moving to the left of the periodic table!

[Baffour Adusei 1L]

Chlorine needs one more electron to become the Cl- anion, so this is where that oxidation number comes from.

[Sean Sanders 1E]

Chlorine only needs one electron to gain a full octet. Therefore, it has an oxidation number of -1 because it will has a -1 charge in its ionic form.

[Nicole 3G]

Cl has 7 electrons. It needs one more electron to complete that octet, explaining its oxidation number that corresponds to it.

[Dillon Taing 3H]

The oxidation number represents the number of electrons gained or lost to have a full valence shell. Chlorine has 7 electrons, so it only needs to gain one electron (-1 oxidation number) to satisfy the octet rule.

[madelyn kelly 1I]

Cl has a -1 charge because it needs 1 more electron it complete its octet.