Topic 1F.11c electron affinity

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Milena Aragon 2B
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Joined: Fri Sep 28, 2018 12:19 am

Topic 1F.11c electron affinity

Postby Milena Aragon 2B » Sun Oct 28, 2018 4:23 pm

I'm kind of confused as to how to determine the electron affinity of an atom since it's not a perfect trend like ionization energy, atomic radii, etc.

For example= 1F.11c) Which element of the following pair has the higher electron affinity: oxygen or sulfur?

I was wondering why the answer is sulfur and not that they have the same electron affinity (like gallium and indium do).

Alyssa Bryan 3F
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Joined: Fri Sep 28, 2018 12:26 am
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Re: Topic 1F.11c electron affinity

Postby Alyssa Bryan 3F » Sun Oct 28, 2018 4:51 pm

I am also confused on how sulfur was the answer for 11c. I was also wondering how to know that the electron affinity for (b) beryllium and magnesium and (d) gallium and indium are equal.

Kavya Juwadi 3C
Posts: 30
Joined: Fri Sep 28, 2018 12:25 am

Re: Topic 1F.11c electron affinity

Postby Kavya Juwadi 3C » Sun Oct 28, 2018 10:14 pm

With regards to the oxygen and sulfur question, if you look at it "normally" along the trend line it makes sense that oxygen has a higher electron affinity. However, as mentioned in the original question, electron affinity is not perfect. Experimental findings show that sulfur has a higher electron affinity which may be due to electron-electron repulsion.


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