Define the term ionization enthalpy? How does it vary along a period and along a group?

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The energy required to remove the outer most orbital electron or valency election is called ionization enthalpy. In atoms if radious increase then attractions among the vacancy electron and nuclei are decrease so less energy required to remove valency elections.so ionization enthalpy in periods left...
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The energy required to remove the outer most orbital electron or valency election is called ionization enthalpy. In atoms if radious increase then attractions among the vacancy electron and nuclei are decrease so less energy required to remove valency elections.so ionization enthalpy in periods left to right and in groupstop to bottom decrease. read less
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