The element with highest first ionization energy is - (1) hydrogen (2) helium (3) lithium (4) sodium

The element with highest first ionization energy is - (1) hydrogen (2) helium (3) lithium (4) sodium
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(2) helium Explanation: The first ionisation energy is the energy required to remove the most loosely held electron from one mole of gaseous atoms to produce 1 mole of gaseous ions each with a charge of 1+. The first first ionisation energy (in KJ per mole) of Hydrogen: around 1200: Helium: about 2500; Lithium: about 500; and Sodium: about 500.
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