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Postby huntercrespo1C » Sun May 06, 2018 7:53 pm

Which element of the following has a higher electron affinity?
So electron affinity means: amount of energy released when an electron is added to a neutral atom or molecule in the gaseous state to form a (-) ion.
Is this the same as ionization energy? What is the trend for this?

Jasmine Emtage-1J
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Re: 2.67

Postby Jasmine Emtage-1J » Sun May 06, 2018 8:38 pm

Ionization energy is the smallest amount of energy it takes to remove an electron from an atom in the gas phase. The trend for ionization energy (I think that's what you're asking for) is that it increases as you move across a period because there are more protons in the nuclei, increasing the nuclear charge of the atom and making it more difficult to remove electrons.

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Re: 2.67

Postby NatalieSDis1A » Sun May 06, 2018 9:02 pm

Adding onto the previous post, ionization energies increase across a period AND decreases down a group.

Ionization energy is the energy require to remove an electron while electron affinity is the energy that is released when an electron is added. More informally, electron affinity was explained to me as how likely an atom is to gain an electron to become full. Elements on the right of the periodic table have the highest electron affinity because they are the closest to becoming full. This does not include noble gasses because for them, gaining an electron would make them unstable. For 2.67:
a. The answer is F because fluorine is closer to the noble gas and more likely to gain an electron.
b. The answer is carbon because the nitrogen atom does not want to gain an electron. If you consider the electron configuration, Nitrogen has 3 unpaired electrons and adding one more would make it unstable.
c . The answer is chlorine because elements in the upper right have the strongest electron affinity.
d. The same reasoning applies as in part c.

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Re: 2.67

Postby Chem_Mod » Sun May 06, 2018 10:15 pm

ionization is the energy required to remove an electron.
electron affinity is the energy released or spent to add an electron.

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