molecules or compounds
Molecule :)
three atoms of oxygen combined together gives ozone
A molecule is a group of more than one atom joined together that acts like a single particle. The atoms in a molecule are held together by chemical bonds. Molecules can be composed of different types of atoms and can range in size and complexity.
A compound.
An atom is the smallest complete particle of an element. A molecule consists of two or more atoms joined together.
more than one oxygen atom joined together by single covalent bonds
"Atom" implies there's only one there. If there were more than one atom, you'd have a compound. Since helium's an element, all that's in it is helium.
When more than one atom is joined together by a chemical reaction, the result is called a chemical bond which holds together molecules and the strength of the bond depends on the atoms or the reaction. ---------------------------- A molecule.
Magnesium chloride is composed of one magnesium atom and two chlorine atoms, making a total of three elements that are joined together to form magnesium chloride.
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Two or more atoms of different elements joined together form a compound. If it is a metal and non-metal (for example sodium and chlorine), they are ionically bonded. If it is two non-metals (for example methane is carbon and hydrogen), they are covalently bonded.
A compound