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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. Ionisation energy

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  • Energy required to remove an electron from each atom of a one mole of gaseous atoms to create one mole of gaseous ions.
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4. Molecular formula

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  • The actual number of atoms of each element present in a compound
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5. Molar mass

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  • Mass per a mole of substance units= g mol-1
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