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Among magnesium silicon and aluminum.. Which has highest ionisation energy?\xa0\xa0 |
| Answer» Ionization enthalpy is the energy required to remove the most loosely\xa0bound electron from an isolated atom (in the gaseous state) for one mole of an\xa0element.Among magnesium,\xa0silicon and aluminum, silicon\xa0has highest ionisation energy.\xa0Magnesium,\xa0aluminum and\xa0silicon are the elements of the third period in the periodic table.\xa0As one moves\xa0from left to right in the periodic table, there is a regular\xa0increase in the magnitude of ionization enthalpy of elements, with a few exceptions. E.g.\xa0The\xa0ionization enthalpy of Al (aluminium) is lower than that of Mg (magnesium).\xa0The first ionization enthalpy\xa0of magnesium\xa0is higher\xa0because the electron is removed from the fully filled \'s\' orbital.The first ionisation enthalpies of magnesium,\xa0aluminum and\xa0silicon\xa0are given below:-\tPeriod\xa0ElementFirst ionisation enthalpyElementFirst ionisation enthalpyElementFirst ionisation enthalpy3\xa0Magnesium\xa0737 kJ mol-1Aluminum577\xa0kJ mol-1Silicon786\xa0kJ mol-1\t | |