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Multiple Choice

A molecule composed of atoms from two or more different elements is called:

A substance made from atoms of different elements joined together in fixed proportions is a compound. This distinguishes it from a pure element, which contains only one type of atom, and from a simple molecule that might consist of atoms from the same element. Here, since the atoms come from two or more elements, the result is a compound. An ion is a charged particle and isn’t defined by having multiple elements in a molecule, though ions can be part of compounds. A molecule is simply a group of two or more atoms bonded together; those atoms can be from the same element (like O2) or different elements (like H2O).

A substance made from atoms of different elements joined together in fixed proportions is a compound. This distinguishes it from a pure element, which contains only one type of atom, and from a simple molecule that might consist of atoms from the same element. Here, since the atoms come from two or more elements, the result is a compound. An ion is a charged particle and isn’t defined by having multiple elements in a molecule, though ions can be part of compounds. A molecule is simply a group of two or more atoms bonded together; those atoms can be from the same element (like O2) or different elements (like H2O).