Respuesta :
Explanation:
(a) potassium oxide
Potassium is the element of group 1 and oxygen is the element of group 16. The most common valency of potassium and oxygen are 1 and 2 respectively.
So, the ionic compound formed:
K (Cation) O (Anion)
1 2
Interchange of the valency, So,
K₂O
(b) iron(III) sulfide
Iron is a d block element and sulfur is the element of group 16. The most common valency of sulfur is 2. The valency of iron is 3 which is written in roman in the name.
So, the ionic compound formed:
Fe (Cation) S (Anion)
3 2
Interchange of the valency, So,
Fe₂S₃
(c) cobalt(I) sulfate
Cobalt is a d block element. The valency of cobalt is 1 which is written in roman in the name. Sulfate is an anion which has formula of SO₄²⁻ .
So, the ionic compound formed:
Co (Cation) SO₄
1 2
Interchange of the valency, So,
Co₂SO₄
