(b) What will be the formula of chloride of A? Valency is the combining power of an atom; so, when we talk of iron having a valency of 2, it can combine either with two atoms of valency of one; or with one atom of valency of two. The valency of an element is related to how many electrons are in the outer shell. The classification of oxides is done into neutral, amphoteric and basic or acidic based on their acid-base characteristics. Hence valency of oxide is 2. Iron II oxide is when iron has a valency of 2 and iron III oxide is when it has a valency of 3. (a) What is the valency of element A? Oxygen has a valency of two and so the formula for iron (II) oxide is FeO. An element A forms an oxide A2O5. Metal oxides typically contain an anion of oxygen in the oxidation state of −2. Iron II oxide is when iron has a valency of 2 and iron III oxide is when it has a valency of 3. A basic oxide is an oxide which when combined with water gives off a base. An oxide is a chemical compound that contains at least one oxygen atom and one other element in its chemical formula. An acidic oxide is an oxide which when combined with water gives off an acid. Iron II oxide is when iron has a valency of 2 and iron III oxide is when it has a valency of 3. Elements in the same group of the periodic table have the same valency.

Iron II oxide is when iron has a valency of 2 and iron III oxide is when it has a valency of 3.
Valency is the combining power of an element.


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