Trends in first ionization energies

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cristinapadilla_1E
Posts: 33
Joined: Fri Sep 28, 2018 12:18 am

Trends in first ionization energies

Postby cristinapadilla_1E » Thu Nov 01, 2018 2:36 pm

What are the trends in first ionization energies throughout the periodic table?

Aaron Ang 4H
Posts: 30
Joined: Fri Sep 28, 2018 12:28 am

Re: Trends in first ionization energies

Postby Aaron Ang 4H » Thu Nov 01, 2018 2:37 pm

First Ionization energies typically decrease down a group and increase across a period (from left to right)

annabel 2A
Posts: 67
Joined: Fri Sep 28, 2018 12:18 am

Re: Trends in first ionization energies

Postby annabel 2A » Thu Nov 01, 2018 2:42 pm

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.

Catherine Kim 3K
Posts: 31
Joined: Fri Sep 28, 2018 12:26 am

Re: Trends in first ionization energies

Postby Catherine Kim 3K » Thu Nov 01, 2018 2:52 pm

First ionization energies increase from left to right on the period table. Electron shielding affects ionization energy.


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