Explain how a compound has different properties from the elements that make up the compound

Dear student,
A compound is formed when elements combine in a fixed ratio by mass such that the resulting specie do not show properties of either element used in making it. For e.g C(s) combines with O2(g) to form CO, CO2. Each of CO and CO2 have totally different properties as compared to either C or O. This is because of now a shared electron pair is attracted by two nuclei and molecular structure is entirely different form Atomic structure.

Hope it helps.

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The elements join many times to be a compound
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A compound is a substance formed when two or more elements are chemically joined. Water, Salt and Sugar are examples of compounds
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