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### 1st and 2nd ionization energy?

Posted: Tue Jul 11, 2017 9:22 pm
What is the difference between the first ionization energy and the second ionization energy?

### Re: 1st and 2nd ionization energy?  [ENDORSED]

Posted: Tue Jul 11, 2017 9:32 pm
First ionization energy is basically the energy required to remove an electron from a neutral atom while in a gas state. The second ionization energy is the energy required to remove another electron from that atom, so you're technically removing an electron from a 1+ ion since that atom already lost an electron already. Hope that helps!

### Re: 1st and 2nd ionization energy?

Posted: Fri Jul 14, 2017 5:43 pm
In terms of equations, the equation for the first ionization of energy is: Na --> Na+ + e-. Whereas the equation for the second ionization of energy is: Na+ --> Na2+ + e-. Also, it takes MORE energy for the second ionization of energy!

Hope this helps!

### Re: 1st and 2nd ionization energy?

Posted: Sun Jul 16, 2017 12:59 pm
Why does it require more energy to remove yet another electron?

### Re: 1st and 2nd ionization energy?

Posted: Sun Jul 16, 2017 1:04 pm
The removal of the first electron reduces the effect of electron-electron repulsion, thus increasing the effective nuclear charge.

Because e- are now more tightly held by the nucleus, a greater amount of energy is required to remove yet another e-.

### Re: 1st and 2nd ionization energy?

Posted: Sun Jul 16, 2017 3:58 pm
Another small thing to remember about the 2nd ionization energy is that it will always be greater than the 1st for the reasons explained above.

### Re: 1st and 2nd ionization energy?

Posted: Sun Oct 22, 2017 10:48 pm
The first ionization energy refers to the amount of energy needed to get one electron from the outer most energy level. The second ionization energy refers to the amount of energy needed to get one more electron out of the outer most energy level.

### Re: 1st and 2nd ionization energy?

Posted: Mon Oct 23, 2017 2:22 pm
The ionization energy to remove the second electron of an atom will always be higher than the ionization energy to remove the first electron because the pull from the nucleus gets stronger and stronger as you begin to remove the electron shells.