Periodic trends

[Yousif Jafar 1G]

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

[Seohyun Park 1L]

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]

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]

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]

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