What term represents a compound

Compound can be described using element symbol and numbers. it is a mixture which is result of two or more chemical element in such a way that atoms of different elements held together by chemical compound that are difficult to break. Most often a compound looks and behave like an element

for example : - Hydrogen and oxygen ... both of these elements are gaseous at room temperature and atmospheric pressure, but when both combined they both form compound water. (H2O)