Which is the best description of a molecule?
o amolecule of an element is composed of at least two types of atoms.
o amolecule of a compound is composed of only one type of atom.
o amolecule of a compound is composed of at least two types of atoms.
o amolecule of an element is composed of exactly two types of atoms.

A molecule of a compound is composed of at least two types of atoms.

Explanation:

The particle that are very smaller and are found in an element or a  compound  is called as molecule. The molecules have the compound's or the element's chemical properties. Chemical bonds links the molecules to stay together. Atoms are the things that makes up the molecule.

The atoms that are present are similar in the molecule of an element. A molecule of a compound contains at least two types of atoms. For example let us consider a compound water. this contains hydrogen and oxygen. In water there will be 2 hydrogen and one oxygen atom. Now let us consider an example of the molecule of an element which is an oxygen. this contains two atoms but they both will be oxygen.

spare some change and give it to the poor

explanation:

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when heated, the valance electrons increased their speed and transferred the heat from electron to electron.   i just took the test.