Question

what is the chemical formula for cobalt(ii) bromide?
co₂br
cobr₂
co₂br₃
co₂br₂
co₃br₂

Explanation:

Step1: Determine the charge of cobalt (II)

Cobalt (II) has a charge of \(+2\), so \(Co^{2+}\).

Step2: Determine the charge of bromide

Bromide ion has a charge of \(-1\), so \(Br^{-}\).

Step3: Balance the charges

To balance the charges, we need 2 bromide ions for 1 cobalt (II) ion.

Answer:

B. \(CoBr_{2}\)