Question

In the reaction between bromine and sodium, a bromine atom gains an electron. What ion is formed? Is the bromine oxidized. or is it reduced?

Answer 1

When bromine gains an  electron it forms Br^- ion and Bromine is reduced coz it gained an electron

Answer 2

Answer:
`Br^-` , It is reduced.

Step-by-step explanation:

Electronic configuration of sodium:

`[Na]=1s^22s^22p^63s^1`

Sodium atom will loose one electron to gain noble gas configuration and form sodium cation with +1 charge.

`[Na^+]=1s^22s^22p^63s^0`

Electronic configuration of bromine:

`[Br]:35:[Ar]3d^(10)4s^24p^5`

Bromine atom will gain one electron to gain noble gas configuration and form bromide ion with -1 charge.

`[Br^-]:36:[Ar]3d^(10)4s^24p^6`

Oxidation reaction is defined as the reaction in which a substance looses its electrons. The oxidation state of the substance increases.

Reduction reaction is defined as the reaction in which a substance gains electrons. The oxidation state of the substance decreases.

`Br+e^-\rightarrow Br^-`