Question

complete the following table: cation formula anion formula compound formula fe2+ co3+ cr2+ o2- f- i-

Explanation:

Step1: Combine Fe²⁺ and O²⁻

The charges must balance. For Fe²⁺ and O²⁻, the compound formula is FeO.

Step2: Combine Fe²⁺ and F⁻

To balance the +2 charge of Fe²⁺ with the - 1 charge of F⁻, we need 2 F⁻ ions. The formula is FeF₂.

Step3: Combine Fe²⁺ and I⁻

To balance the +2 charge of Fe²⁺ with the - 1 charge of I⁻, we need 2 I⁻ ions. The formula is FeI₂.

Step4: Combine Co³⁺ and O²⁻

To balance the +3 charge of Co³⁺ and - 2 charge of O²⁻, we need 2 Co³⁺ and 3 O²⁻. The formula is Co₂O₃.

Step5: Combine Co³⁺ and F⁻

To balance the +3 charge of Co³⁺ with the - 1 charge of F⁻, we need 3 F⁻ ions. The formula is CoF₃.

Step6: Combine Co³⁺ and I⁻

To balance the +3 charge of Co³⁺ with the - 1 charge of I⁻, we need 3 I⁻ ions. The formula is CoI₃.

Step7: Combine Cr²⁺ and O²⁻

The charges balance directly. The formula is CrO.

Step8: Combine Cr²⁺ and F⁻

To balance the +2 charge of Cr²⁺ with the - 1 charge of F⁻, we need 2 F⁻ ions. The formula is CrF₂.

Step9: Combine Cr²⁺ and I⁻

To balance the +2 charge of Cr²⁺ with the - 1 charge of I⁻, we need 2 I⁻ ions. The formula is CrI₂.

Answer:

Cation Formula	Anion Formula	Compound Formula
Fe²⁺	F⁻	FeF₂
Fe²⁺	I⁻	FeI₂
Co³⁺	O²⁻	Co₂O₃
Co³⁺	F⁻	CoF₃
Co³⁺	I⁻	CoI₃
Cr²⁺	O²⁻	CrO
Cr²⁺	F⁻	CrF₂
Cr²⁺	I⁻	CrI₂