Define Ionization energy. How does it vary along the period and down the group?
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The amount of energy required to remove an electron from an isolated gaseous atom in the ground state is called ionization enthalpy. ... Reason: This is because along the period atomic size decreases and effective nuclear charge increases. Ionization enthalpy decreases down the group.
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physics and chemistry, ionization energy or ionisation energy is the minimum amount of energy required to remove the most loosely bound electron of an isolated neutral gaseous atom or molecule.
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