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2. Electron shielding

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  • 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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3. Stoichiometry

  • Molar relationship between the relative quantities of substances taking part in a reaction.
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4. Empirical formula

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  • The lowest whole number ration of each element present in a compound
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5. Molecule

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  • A small group of atoms held together by covalent bonds.
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