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

The formula of the sulphate of an element M is M_2(SO_4)_3 . Write the formula of its Oxide.

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

Write valency of element E.

An element 'X' belongs to 3rd period and group 16 of the Modern Periodic Table. (a) Identify the element. (b) Is it a metal or non-metal ? (c) What is the valency of the element ? (d) Write the formulae of its compound with hydrogen.

The formula of the sulphate of an element M is M_2(SO_4)_3 . Write the formula of its Phosphate.

The formula of the sulphate of an element M is M_2(SO_4)_3 . Write the formula of its Acetate.

The formula of the sulphate of an element M is M_2(SO_4)_3 . Write the formula of its Chloride.

The atomic mass of an element is a and the formula of its oxide is M_(2)O_(n) . Show that the equivalent mass of the element is (a)/(n) .

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