If the group of atoms are all the same, it is called a molecule. If the group of atoms are different, it is called a compound, assuming they are bonded in some way. Otherwise, it is just called a group of atoms.
ion
This sounds to me like you are wanting the term "molecule". A molecule is a group of atoms bonded together.
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If the group of atoms are all the same, it is called a molecule. If the group of atoms are different, it is called a compound, assuming they are bonded in some way. Otherwise, it is just called a group of atoms.
A molecule is represented by a group of atoms bonded together to form a chemical structure. This representation can vary depending on the method used: for example, a molecular formula shows the types and numbers of atoms in the molecule, while a structural formula shows the arrangement of atoms and bonds.