An element X shows two valencies of 3 and 5. Work out the formulae of two oxides of this element.

An element X shows two valencies i.e. 2 and 4. Write the formula of its oxides.

An element B show valencies of 4 and 6. Write the formulae of its two oxides.

(a) An element X exhibits variable valencies 3 and 5. Write the formulae of the chlorides of the element. (b) What is the ratio by mass of the elements present in the chemical formula of magnesium oxide

An element X shows a variable valency of 3 and 5. What are the formulae of the oxide formed by it?

An element X has a valency of 2. Write the simplest formula for : (a) bromide of the element (b) oxide the element

The valency of an element A is 4. Write the formula of its oxide.

An element Z has valency of 3. Write down the formula of its oxide?

Which element does not show a valency of 2