size of atom and ion

[joonkimdds]

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between K+ and Cl- (both of them are basically Ar), K+ is smaller because K+ got more protons than Cl-.
when there are same number of electrons, more protons have stronger pull on electrons thus K+ is smaller.


But why is Cl- bigger than Cl? Cl- has one more electron than Cl so
when there are same number of protons, shouldn't more electrons meaning stronger pull on protons thus Cl- is smaller?

 

[tranv117]

think about it like this. same # of protons, one has one more electron. More electrons will repel each other more therefore Cl- would be larger (neg repels neg)

 

[rdhdds1]

between K+ and Cl- (both of them are basically Ar), K+ is smaller because K+ got more protons than Cl-.
when there are same number of electrons, more protons have stronger pull on electrons thus K+ is smaller.


But why is Cl- bigger than Cl? Cl- has one more electron than Cl so
when there are same number of protons, shouldn't more electrons meaning stronger pull on protons thus Cl- is smaller?

I believe that the opposite holds true. Your reasoning is fair but I believe it is reversed.

More e- so there is more pulling away from the nucleus and thus makes the atom bigger (expands the orbitals?).

I might be completely off my rocker. I have been studying for about 9 hours and am seeing double in my own logic.

Anyone else?

 

[joonkimdds]

Thanks two of u~ that was good enough explanation to make me understand.

 

[anesthesia_209]

I believe this has to do with effective nuclear charge.
Between Cl and Cl-, you have the same amount of protons. The more electrons you have, the bigger it will be because the 'pull' of the protons is more spread out over more electrons. This results in them atom being bigger overall.

 

[rdhdds1]

Thanks two of u~ that was good enough explanation to make me understand.

No prob bob............keep up the good studying and we are all here if you need anything