Electron Affinty

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Brittney Hun 2C
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Joined: Wed Sep 11, 2019 12:15 am

Electron Affinty

Postby Brittney Hun 2C » Fri Oct 25, 2019 11:21 am

Since electron affinity is a neutral atom's likelihood of gaining an electron, what is the periodic trend? Does this have to do with filling its valence shell?

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Joined: Fri Aug 30, 2019 12:16 am

Re: Electron Affinty

Postby 405335722 » Fri Oct 25, 2019 11:32 am

As you move across a period, atoms have higher electron affinity because they want to fill their valence shell. For example, Lithium is less likely to gain an electron because they want to "get rid of" the one they already have in their 2s shell versus Fluorine that wants an electron to complete its octet.

Justin Quan 4I
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Re: Electron Affinty

Postby Justin Quan 4I » Fri Oct 25, 2019 11:41 am

The electron affinity trend increases from left to right and upward for groups because atoms towards the right side of the periodic table have more valance electrons, therefore they want to complete their valance shell by accepting electrons rather than losing them. For example, F and Cl, both on the right side of the periodic table, really want to gain an e- to complete their valance shell. That's why are you approach the righthand side of the periodic table, electron affinity increases.

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Re: Electron Affinty

Postby AGulati_4A » Fri Oct 25, 2019 11:56 am

"Electron affinity increases as the number of valence electrons in a compound decrease". If you can remember this, you do not need to memorize the periodic trend

Kaitlyn Ang 1J
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Re: Electron Affinty

Postby Kaitlyn Ang 1J » Fri Oct 25, 2019 12:06 pm

Electron affinity has the same periodic trend as ionization energy, so if you remember IE, you can remember EA

Joseph Saba
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Re: Electron Affinty

Postby Joseph Saba » Fri Oct 25, 2019 1:33 pm

Electron affinity is also related to Electronegativity, if an atom has a high electronegativity, the electron affinity will also be high.

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