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Elyssa Smith 4B
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Joined: Wed Sep 18, 2019 12:22 am


Postby Elyssa Smith 4B » Thu Oct 24, 2019 11:31 am

As someone who in unfamiliar with chemistry, what periodic trends are the most important for this class?

Jessica Castellanos
Posts: 102
Joined: Sat Aug 24, 2019 12:17 am
Been upvoted: 1 time

Re: Trends

Postby Jessica Castellanos » Thu Oct 24, 2019 11:39 am

I think the most important trends to know are electronegativity and ionization energy because it will be important with bonding, but in general you should know the ionic radius and electron affinity trends as well (the trends are pretty similar) just in case there's a question on it. I hope this helps!

Rita Chen 1B
Posts: 112
Joined: Sat Jul 20, 2019 12:15 am

Re: Trends

Postby Rita Chen 1B » Thu Oct 24, 2019 12:15 pm

Knowing the ionization energy and electron affinity (electronegativity) is probably the most important. It may also help to know the trends in the size of these atoms because it can really help you determine the other two. The other two are important because they can help you determine what will be bonded with what and the type of bond as well.

Diana Chavez-Carrillo 2L
Posts: 122
Joined: Fri Sep 28, 2018 12:18 am

Re: Trends

Postby Diana Chavez-Carrillo 2L » Thu Oct 24, 2019 12:23 pm

I think some of the main trends you should keep in mind are:
Electron affinity:
Lavelle mentioned that this is less periodic but generally there is HIGH electron affinity for elements in the TOP RIGHT of the periodic table (Group 17).

Atomic radius :
increases DOWN the periodic table
increases FROM RIGHT (right being the smallest) TO LEFT (left being the bigger atomic radius)

Ionization Energy:
increases from LEFT to RIGHT
increases from BOTTOM to TOP

increases from LEFT TO RIGHT
increases from BOTTOM to TOP

Note: you can see how electroneg. and ionization has the same trend but the atomic radius is the opposite of them.

Hope that helps! :)

Audrie Chan-3B
Posts: 50
Joined: Thu Jul 25, 2019 12:17 am

Re: Trends

Postby Audrie Chan-3B » Thu Oct 24, 2019 12:29 pm

It's important to know that the trend for atomic radius is increasing increasing left and down. The trend for electronegativity and ionization energy is the opposite: increasing up and right.

Anna Chen 1K
Posts: 104
Joined: Thu Jul 25, 2019 12:18 am

Re: Trends

Postby Anna Chen 1K » Sat Oct 26, 2019 7:16 pm

You should be familiar with atomic radius, ionization energy, electron affinity, and electronegativity.

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