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A group of two or more atoms held together by chemical bonds would be termed a molecule.
A single molecule of table salt contains two atoms: sodium (Na) and chlorine (Cl). So a billion molecules of salt would require two billion atoms.
the smallest atom is hydrogen, the smallest molecule would be the naturally occurring diatomic hydrogen.
Technically yes. It would have to be an extremely complex molecule with many chains of atoms. Usually a molecule remains small so that it can broken down and put back together easily. So a polymer of millions of molecules (which themselves contain many atoms) would qualify.
Dinitrogen tetroxide
double covalent bond
If you wrote S8, people would think there were 8 sulfur atoms in the molecule. S is the symbol for the element sulfur, S8 is the symbol of an allotropic form.
you would have 6.022 x 10^23 atoms (Avogadro's number)
In each sulfur trioxide molecule there is one sulfur atom and three oxygen atoms, giving a total of four atoms. In 1.14 moles of sulfur trioxide, there would be 1.14 x 6.02 x 10^23 = 6.87 x 10^23 molecules. Accordingly, there would be 4 x 6.87 x 10^23 = 2.75 x 10^24 atoms in total.
Sodium Sulfate is Na2SO4 and so there are 7 atoms in the molecule.
Sulfur dioxide.
A group of two or more atoms held together by chemical bonds would be termed a molecule.
0.45 mol BaSO4 have 2,698.10e23 sulfur atoms.
Sulfur Dioxide
Sulfur hexafluoride has covalent bonds.
Iron sulfide
A single molecule of table salt contains two atoms: sodium (Na) and chlorine (Cl). So a billion molecules of salt would require two billion atoms.