Posted Mon 5th November, 2012 @ 20:04 by anonymous
Basically when you remove one electron, u need a certain amount of energy, or the first ionisation energy. This is a certain amount of energy depending on the element, and when you have taken the first electron, you leave a positive ion behind, which makes a stronger attraction on the remaining electrons. Imagine u had cake, someone steals a piece, so you decide to protect the other pieces more, LOL. This means that as you get to the second ionisation energy or removing a second electron, it requires more energy to remove, and the third IE requires more than the second, and so on.
Once you have removed the first electron you are left with a positive ion. Trying to remove a negative electron from a positive ion is going to be more difficult than removing it from an atom as there is the same positive charge but less electrons so the positive charge has a greater effect on the remaining electrons.