Why is 2nd ionization energy higher than 1st?
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Explanation:
Second ionisation energy is defined by the equation: It is the energy needed to remove a second electron from each ion in 1 mole of gaseous 1+ ions to give gaseous 2+ ions. More ionisation energies. You can then have as many successive ionisation energies as there are electrons in the original atom.
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The second ionization energy of Mg is larger than the first because it always takes more energy to remove an electron from a positively charged ion than from a neutral atom.
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