What are the oxidation numbers of k, c, and o in k2co3?

K = +1

O = -2

C = +4

Explanation:

1. Find the oxidation number for K:

As the potassium is a metal from the group I in the periodic table, it has the number of oxidation +1

2. Find the oxidation number for O:

As the number of valence electrons of the oxygen is 6, its oxidation number is -2, that is the number of electrons left to complete the octet rule.

3. Find the oxidation number for C:

To find this oxidation number first multiply the oxidation numbers of the other elements by the quantity of each element in the molecular formula.

K = +1 * 2 = +2

O = -2 * 3 = -6

Therefore the oxidation number for C will be +4 because the addition of the oxidation numbers in the molecule must be equal to zero.

the answer is:  

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