Zeff and ionization energy

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Ashley R 1A
Posts: 41
Joined: Sat Aug 24, 2019 12:16 am

Zeff and ionization energy

Postby Ashley R 1A » Sun Oct 27, 2019 3:49 pm

What exactly is the connection between increasing effective nuclear charge (Zeff) and ionization energy increasing across a period? I understand that Zeff increases as you move down, but I'm getting lost on how it's connected to the ionization energy.

Myka G 1l
Posts: 100
Joined: Fri Aug 30, 2019 12:17 am

Re: Zeff and ionization energy

Postby Myka G 1l » Sun Oct 27, 2019 5:23 pm

The higher the effective nuclear charge, the greater the pull of electrons to the nucleus. Therefore, the electrons will be harder to remove when the ENC is higher and the ionization energy will be higher.

Jada Brown 2H
Posts: 100
Joined: Sat Aug 17, 2019 12:15 am

Re: Zeff and ionization energy

Postby Jada Brown 2H » Sun Oct 27, 2019 5:35 pm

As you move across a period, there are more protons in the nucleus of each atom which creates a greater pull on electrons. This in turn causes the ionization energy to increase as well.

Elizabeth Harty 1A
Posts: 125
Joined: Sat Jul 20, 2019 12:16 am

Re: Zeff and ionization energy

Postby Elizabeth Harty 1A » Sun Oct 27, 2019 5:38 pm

Ionization energy is the minimum energy required to remove one mol of electrons from one mol of an atom. Therefore, the tighter the hold on the electrons, the higher the ionization energy is as it is more difficult to remove said valence electron. Species with higher effective nuclear charge have a tighter hold on the electrons and therefore a higher ionization energy.

Siddiq 1E
Posts: 106
Joined: Fri Aug 09, 2019 12:15 am

Re: Zeff and ionization energy

Postby Siddiq 1E » Sun Oct 27, 2019 6:44 pm

Doesn't nuclear charge decrease down a group? I'm confused as to why the trend doesn't follow the ionization energy trend exactly.

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