Why is the 2nd Ionization Energy greater than the 1st when it comes to removing successive...

Why is the 2nd Ionization Energy greater than the 1st when it comes to removing successive valence electrons when you haven't changed the shielding/number of core electrons. For example, why does it take more energy to remove a 2nd valence electron from say Flourine, even though the number of core electrons (2) hasn't changed at all? Shouldn't that 2nd valence electron still be feeling the same effective nuclear charge from the nucleus?

Expert Solution

2nd electrons feels the same nuclear charge but what about the electrostatic force.

1st electron was removed from a neutral atom.

But after removing 1 electron, atom now has a +1 charge.

2nd electron will face now extra electrostatic force due to this +1 charge.

This is the reason for 2nd ionisation energy to be larger than 1st ionisation energy

queen_honey_blossom answered 2 years ago

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