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Atomic Weight
The average mass of atoms of an element, calculated using the relative abundance of isotopes in a naturally-occurring element.
Structural Formula
A type of chemical formula that shows the spatial arrangement of the atoms in a molecule. Compare with the simplest formula and molecular formula.
Molecular Formula
The type of chemical formula that gives the actual numbers of each type of atom in a molecule. Compare with simplest formula and structural formula.
Lewis Structure
A graphical representation of the valence electrons in molecules, showing how the atoms are bonded together and the lone pairs of electrons.
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