Calculate the formal charge of each element in the following compounds or ions.
(a) CN¯
(b) COF2
(c) BCl4¯
(d) IBr3
a) (a) C: +1, N: -1; (b) C: +1, O: -1, F: 0; (c) B: +1, Cl: -1; (d) I: +1, Br: -1
b) (a) C: +1, N: -1; (b) C: +1, O: -1, F: +1; (c) B: +1, Cl: -1; (d) I: +1, Br: +1
c) (a) C: 0, N: -1; (b) C: 0, O: -1, F: 0; (c) B: 0, Cl: -1; (d) I: 0, Br: -1
d) (a) C: 0, N: -1; (b) C: 0, O: -1, F: +1; (c) B: 0, Cl: -1; (d) I: 0, Br: 0
