A small group of atoms held together by covalent bonds.
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7. Electron shielding
The repulsion of electrons in different inner shells, shielding reduces the net attraction force from the positive nucleus on the outer shell electron.
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8. Empirical formula
The lowest whole number ration of each element present in a compound
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9. Stoichiometry
Molar relationship between the relative quantities of substances taking part in a reaction.
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10. Oxidation number
Measure of the number of electrons that an atoms used to bond with an atoms of another element, oxidation numbers are derived from a set of rules.
