Question

Cr²0⁷-² oxidation number of central atom is​

Answer 1

This is the dichromate ion,

C

r

2

O

2

−

7

.

Oxygen is more electronegative than chromium, so it'll take its usual

−

2

charge here. There are seven oxygen atoms, so the total charge is

−

2

⋅

7

=

−

14

.

Let

x

be the oxidation number of two chromium atoms. So, we got:

x

+

(

−

14

)

=

−

2

x

−

14

=

−

2

x

=

12