Periodic trends

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Yousif Jafar 1G
Posts: 59
Joined: Thu May 10, 2018 3:00 am

Periodic trends

Postby Yousif Jafar 1G » Fri Nov 02, 2018 10:56 am

What periodic trends do we need to know for the midterm?

Seohyun Park 1L
Posts: 73
Joined: Fri Sep 28, 2018 12:29 am

Re: Periodic trends

Postby Seohyun Park 1L » Fri Nov 02, 2018 11:12 am

Most likely atomic radius, ionization energy, electron affinity, and electronegativity. You will probably also need to know the trends for ionic radii.

Raymond Ko 1H
Posts: 29
Joined: Fri Sep 28, 2018 12:19 am

Re: Periodic trends

Postby Raymond Ko 1H » Fri Nov 02, 2018 11:13 am

We should generally know 4 trends, I believe:

Ionization energy increases across a period and decreases down a group.
Electron Affinity increases across a period and decreases down a group.
Atomic Radius decreases across a period and increases down a group.
Electronegativity increases across a period and decreases down a group.

Know that there are some exceptions to the trends based on the stability of how electrons fill orbitals for each atom.

madisondesilva1c
Posts: 91
Joined: Fri Sep 28, 2018 12:16 am

Re: Periodic trends

Postby madisondesilva1c » Fri Nov 02, 2018 11:17 am

I believe that we need to know the trends up to the lecture Wednesday therefore the ones that would be included are atomic radius, ionization energy, electronegativity, and electron affinity. I find it helpful to think about how the trends are related to each other and then you will have a better idea of how to access them on and off of the periodic table.

Ionization energy, electronegativity, and electron affinity increase across a period.
Atomic radius decreases across the period.

Ionization energy, electronegativity, and electron affinity decrease down a group while atomic radius increases down a group.

Brian Kwak 1D
Posts: 88
Joined: Fri Sep 28, 2018 12:17 am

Re: Periodic trends

Postby Brian Kwak 1D » Sat Nov 03, 2018 10:25 pm

Thank you guys for posting this. Missed some lectures due to a concussion and you guys just saved my life.


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