Two atoms of carbon are included in one formula unit of the compound [tex]Na_2C_2O_4[/tex].
A compound is a substance that results from a combination of two or more different chemical elements, in such a way that the atoms of the different elements are held together by chemical bonds that are difficult to break.
Compounds are made of two or more atoms of different elements, such as water ([tex]H_2O[/tex]) and methane ([tex]CH_4[/tex]).
Atoms are not drawn to scale. Molecules of compounds have atoms of two or more different elements.
For example, water ([tex]H_2O[/tex]) has three atoms, two hydrogen (H) atoms and one oxygen (O) atom.
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