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

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

An element X has valency 3 while the element Y has valency 2. Write the formula of the compound berween X and Y

(a) Write the symbols/formulae of two simple ions and two compound ions (or polyatomic ions). (b) An element Y has a valency of 4. Write the formula for its : (i) Chloride , (ii) oxide , (iii) sulphate, (iv) carbonate , (v) nitrate

An element E is trivalent. Write the formula of its (i) chloride (ii) oxide.

An element Y has a valancy of 4. Write the formula for its carbonate

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

An element Z has a valency of 3. What is the formula of oxide of Z ?

An elements P has atomic no. 13. Write the formula of its oxide