State and explain the trend in first ionization energies shown by the elements with the atomic numbers 2,10 and 18.
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Expert's answer
2017-05-10T10:47:09-0400
Elements with the atomic numbers 2, 10 and 18 are respectively: Helium, Non, Argon. They belong to the VIII period of Periodic Table. First ionization energy (energy of an atom that is required to remove one electron from an atom in its gaseous state) in this period demonstrates gradual increase. This is because because the electrons are held tighter by the higher effective nuclear charge.
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