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Trends in first ionization energies

Posted: Thu Nov 01, 2018 2:36 pm
by cristinapadilla_1E
What are the trends in first ionization energies throughout the periodic table?

Re: Trends in first ionization energies

Posted: Thu Nov 01, 2018 2:37 pm
by Aaron Ang 4H
First Ionization energies typically decrease down a group and increase across a period (from left to right)

Re: Trends in first ionization energies

Posted: Thu Nov 01, 2018 2:42 pm
by annabel 2A
Across a period (from left to right), first ionization energy increases. This makes sense since across a period, the number of protons are increasing while the valence electrons are being added to the same energy shell (so they aren't further from the nucleus). This means the nucleus can hold onto the electrons more tightly as the nucleus gets more positive across the period.
Down a group, first ionization energy decreases. This makes sense because down a group, the energy shells are increasing, so the valence electrons are further from the nucleus, and the nucleus cannot hold onto the valence electrons as tightly.

Re: Trends in first ionization energies

Posted: Thu Nov 01, 2018 2:52 pm
by Catherine Kim 3K
First ionization energies increase from left to right on the period table. Electron shielding affects ionization energy.