Ionization Energy
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Re: Ionization Energy
Across a period, nuclear charge increases while the electrons are removed from the same shell (which means that the number of inner shells of electrons remains the same), hence the effective nuclear charge increases. Atomic radius also decreases across a period. Hence, valence electrons are increasingly more attracted by the positive nucleus and more energy is required to remove the valence electrons. That's why ionization energy usually increases across a period.
(There are some exceptions but I think they are not covered during lectures.)
(There are some exceptions but I think they are not covered during lectures.)
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Re: Ionization Energy
The ionization energy increases because there is a stronger positive nuclear charge that pulls the electron towards the center. In addition, as there are more electrons in one cloud, the more it wants to fill up the octet rather than getting rid of the electrons.
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