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The answer is that compounds are formed when elements are joined and held together by strong forces called chemical bonds. ... Covalent bonds share electrons between atoms in order to fill their electron shells. In the compound, molecules are held together by the attraction between the nucleus and the shared electrons.

Millions of compounds can be made from just 100 elements because the atoms of these 100 elements can combine with each other in different ways to produce countless compounds.

A compound is formed when atoms of two or more elements are chemically combined together.

100 elements can combine with each other in many different ways. For instance, carbon combines with almost all the known elements to form unique compounds in each case depending on the arrangement of atoms of elements or type of element in each of the compounds formed.

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