ionization energy

Moderators: Chem_Mod, Chem_Admin

Ruiting Jia 4D
Posts: 65
Joined: Fri Sep 28, 2018 12:27 am

ionization energy

Postby Ruiting Jia 4D » Sun Oct 28, 2018 1:14 pm

Why is the 2nd ionization energy of an element always higher?

Sara Flynn 2C
Posts: 60
Joined: Fri Sep 28, 2018 12:23 am

Re: ionization energy

Postby Sara Flynn 2C » Sun Oct 28, 2018 1:18 pm

The pull from the nucleus increases for each individual electron because it has less electrons to pull when it has a charge of plus one and so the electrons that remain are more difficult to remove and require more energy to remove than the first electron

Erica Li 1C
Posts: 31
Joined: Fri Sep 28, 2018 12:17 am

Re: ionization energy

Postby Erica Li 1C » Sun Oct 28, 2018 1:19 pm

Removing the first electron is easier since the pull isn't as strong but the second one is always harder since there is a pull on the electrons that are left so it's harder for them to be removed

Krisdylle Repollo 4H
Posts: 33
Joined: Fri Sep 28, 2018 12:28 am

Re: ionization energy

Postby Krisdylle Repollo 4H » Sun Oct 28, 2018 1:19 pm

This is because the more electrons you take away from an atom, the stronger the attraction between the nucleus and the remaining electrons are. The atom then becomes positive which leads to a greater energy needed to remove the next electron from the atom.

Elaine Pham 2E
Posts: 58
Joined: Fri Sep 28, 2018 12:28 am
Been upvoted: 1 time

Re: ionization energy

Postby Elaine Pham 2E » Sun Oct 28, 2018 1:20 pm

The 2nd ionization energy is always higher than the first ionization energy because when removing the second electron, you are removing it from the cation of the element. It takes more energy to remove an electron from a cation than a neutral atom because the cation is holding onto the electrons more tightly due to the attraction of the positive nucleus.

Jake Gordon 1A
Posts: 61
Joined: Fri Sep 28, 2018 12:15 am

Re: ionization energy

Postby Jake Gordon 1A » Mon Oct 29, 2018 11:21 am

The second ionization energy occurs after one electron has been removed. Assuming the element is neutral at first, taking away an electron will make a cation and leave the same number of positive protons with one less negative electron. Electrostatic attraction increases the pull of the electrons to the nucleus making it require more energy to rip away a second electron creating a potential +2 cation.

Posts: 66
Joined: Fri Sep 28, 2018 12:15 am

Re: ionization energy

Postby ran2000 » Tue Oct 30, 2018 11:06 am

Because the second ionization energy is the removal of the electron from a cation which has a stronger pull on the electron than the neutral atom.

Posts: 30
Joined: Fri Sep 28, 2018 12:19 am

Re: ionization energy

Postby MaggieMatern_Dis1H » Tue Oct 30, 2018 10:16 pm

The outermost electron occupies the highest energy level, and is the furthest from the nucleus and therefore experiences the weakest attraction from the nucleus.
Therefore, it takes the least amount of energy to remove this electron.
An atom that has lost an electron is now a cation and now the amount of positive charge from the nucleus exceeds the negative charge of the electrons, so the attractive force is very strong.
That would make it very hard (i.e. require a high amount of energy) to remove an electron.

Return to “Ionic & Covalent Bonds”

Who is online

Users browsing this forum: No registered users and 1 guest