[" What is element "9],[" what is compound? "]

In what ratio elements combine to form a compound ?

What is the reason for the catalytic activity of transition elements and their compounds ?

what elements do the following compounds contain ? Sugar , common salt

An element forms two compounds X and Y in which the element exhibits the valency of 2 and 3 respectively. What is the ratio of the equivalent masses of the element in the two compound?

What is the difference between an element and a compound?

In Co2 what is the elemental percentage of C in compound?