C. what is the formal charge of the chlorine atom in the chlorate ion (cio3)? +2, +2, 0, -1, -2

0

Explanation:

Chlorate ion () :

Valence electrons of chlorine = 7

Valence electrons of oxygen = 6

Charge = -1 which means one electron is gained

The total number of the valence electrons  = 7 + 3(6) + 1 = 26

The Lewis structure is drawn in such a way that the octet of each atom and duet for the hydrogen in the molecule is complete. So,  

The Lewis structure is shown in the image.

Formula for formal charge :

From the structure,

the positions which points up in upward carbon and down in downward carbon are axial

and vice versa holds true for equatorial positions

so the correct answer with labelled diagram will be