For each of the following pairs, indicate which element has the larger first ionization energy Mg or Al. i put Mg. Repulsion of paired electrons in Mg is more significant than Al's higher effective nuclear charge. but got it wrong.
Al. Repulsion of paired electrons in Al is more significant than Mg's higher effective nuclear charge.
Mg. Repulsion of paired electrons in Mg is more significant than Al's higher effective nuclear charge.
Al. Shielding of the outermost electron of Al is more significant than Mg's higher effective nuclear charge.
Mg. The shielding and higher energy of the 3p1 valence electron of Al is more significant than the increase in the nuclear charge
those are the four choice3s
To be honest about it I don't like any of the answers. Mg has the higher IP because, in my opinion, the added electron in Al is at the next higher energy level (farther from the nucleus) which makes it easier to ionize aluminum's outside electron. I suppose choice 4 comes the closest to what I wrote above.
The correct answer is Al. The repulsion of paired electrons in Al is more significant than Mg's higher effective nuclear charge.
To determine which element has the larger first ionization energy, we need to consider a few factors.
First, the effective nuclear charge refers to the attractive force between the positively charged nucleus and the negatively charged valence electrons. A higher effective nuclear charge means that the nucleus is better at attracting the electrons.
However, in this case, the repulsion of paired electrons in Al is more significant. Al has three valence electrons, and they occupy the 3p orbital. Two electrons occupy one of the 3p orbitals, which leads to electron-electron repulsion. This repulsion makes it easier to remove one electron from Al, resulting in a lower first ionization energy.
On the other hand, Mg has a higher effective nuclear charge but does not have the same repulsion from paired electrons. Therefore, the repulsion of paired electrons in Al outweighs Mg's higher effective nuclear charge, making Al have a larger first ionization energy.
So, the correct choice is Al: Repulsion of paired electrons in Al is more significant than Mg's higher effective nuclear charge.