Because, after removing two electrons from mg, it acquire stable noble gas configuration or in other words, the higher enthalpy of lattice formation of mg2+ is more than compensates the second ionisation enthalpy requires for the formation of div
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The First Ionization Energy
The energy needed to remove one or more electrons from a neutral atom to form a positively charged ion is a physical property that influences the chemical behavior of the atom. By definition, the first ionization energy of an element is the energy needed to remove the outermost, or highest energy, electron from a neutral atom in the gas phase.
The process by which the first ionization energy of hydrogen is measured would be represented by the following equation.
H(g)  H+(g) + e-Ho = -1312.0 kJ/mol
The energy needed to remove one or more electrons from a neutral atom to form a positively charged ion is a physical property that influences the chemical behavior of the atom. By definition, the first ionization energy of an element is the energy needed to remove the outermost, or highest energy, electron from a neutral atom in the gas phase.
The process by which the first ionization energy of hydrogen is measured would be represented by the following equation.
H(g)  H+(g) + e-Ho = -1312.0 kJ/mol
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