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Trends to Know

Posted: Sun May 06, 2018 6:08 pm
by DomMaiorca_1I
For the midterm, I know the important trends to know are atomic radii, ionic radii, and ionization energy. Are there any other trends I'm forgetting that we should definitely know? And if so, could you explain the trend?

Re: Trends to Know

Posted: Sun May 06, 2018 6:48 pm
by MeghetyManoyan1A
There's the trend of electronegativity. As you move from left to right, electronegativity increases, and as you move from top to bottom, electronegativity decreases, with some exceptions.

Re: Trends to Know

Posted: Sun May 06, 2018 7:04 pm
by Amanda 1A
what would the specific exceptions be or what trend do the exceptions follow? or are they not relevant to what we would need to know for the midterm?

Re: Trends to Know

Posted: Sun May 06, 2018 7:23 pm
by Harmonie Ahuna-1C
Another trend is electron affinity. Electron affinity tells how how much energy must either be supplied (-) or is released(+) when an electron attaches to an atom. It generally increases as you move right and up along the periodic table. However, noble gases in group 18 have low ones because they're already stable. There may be some other exceptions shows on figure 2.28 on pg 56 of the textbook.

Re: Trends to Know

Posted: Sun May 06, 2018 9:30 pm
by Shione Nakahara 1F
I think you should know how electron affinity increases from left to right within a period (caused by the decrease in atomic radius) and how electron affinity decreases from top to bottom within a group (caused by the increase in atomic radius).

Re: Trends to Know

Posted: Sun May 06, 2018 9:52 pm
by hannahtweedy
All the ones listed so far are the only ones we went over in Step Up

Re: Trends to Know

Posted: Sun May 06, 2018 10:11 pm
by Madeleine Farrington 1B
Harmonie Ahuna-1C wrote:Another trend is electron affinity. Electron affinity tells how how much energy must either be supplied (-) or is released(+) when an electron attaches to an atom. It generally increases as you move right and up along the periodic table. However, noble gases in group 18 have low ones because they're already stable. There may be some other exceptions shows on figure 2.28 on pg 56 of the textbook.

Why does electron affinity increase as you move up along the table? I was under the impression that atoms further to the right had increased affinity because they are closer to achieving the stable state of a full valence shell, but how does this correspond to moving up the table?

Re: Trends to Know

Posted: Sun May 06, 2018 10:23 pm
by Jennifer Tuell 1B
I'm pretty sure this won't be on the midterm. The midterm covers Chapter 1 and 2 and the Fundamentals.

Re: Trends to Know

Posted: Sun May 06, 2018 10:25 pm
by SammiOrsini_1B
I thought electron affinity was apart of chapter 2, I am just not positive if we specifically covered that in class.

Re: Trends to Know

Posted: Sun May 06, 2018 11:05 pm
by Rummel Requerme 1E
Professor Lavelle said to only worry about Chapter 1, 2, and the Fundamentals. Best to review Outline 1 & 2!

Re: Trends to Know

Posted: Mon May 07, 2018 12:11 am
by Maria Roman 1A
Trends to know would be the atomic radius, cation and anion trends, ionization energy, and electronegativity

Re: Trends to Know

Posted: Mon May 07, 2018 12:14 pm
by breannasung_1K
It might be best to know the trends for electron affinity. Electron affinity increases as ionization energy increases.

Re: Trends to Know

Posted: Mon May 07, 2018 11:42 pm
by JooHyun Koh 1H
Yea, My TA said that Professor Lavelle didn't really cover electron affinity and said it would most likely not be on the exam.