which is bigger between Cl and Cl-?

[joonkimdds]

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I was wondering which is bigger.
I think Cl- is smaller because it gains more electrons when the proton numbers are the same so wouldn't there be more attraction between proton and neutrons?

But according to the rule, non metal ions are bigger than their neutral state. I don't know how this works.

K+ has higher ionization energy than Cl- because K+ has more protons than Cl- so there are stronger attraction.

 

[nze82]

An anion is always larger than the neutral atom, because to become an anion the atom must gain additional electrons. Acquiring these additional electrons adds to the repulsive force between the electrons orbiting the nucleus, causing them to repel each other even further. This will ultimately result in a larger species.

 

[joonkimdds]

Oh i see. I guess 5 proton + 4 electrons are different from 4 protons + 5 electrons when it comes to size.

 

[dentista123]

Oh i see. I guess 5 proton + 4 electrons are different from 4 protons + 5 electrons when it comes to size.

Likewise, a cation is always smaller.

 

[yuppers]

The guys ahead of me explained it correctly, but I just want to point out some things so you dont make this mistake again....

I was wondering which is bigger.
I think Cl- is smaller because it gains more electrons when the proton numbers are the same so wouldn't there be more attraction between proton and neutrons? protons and neutrons have NO attraction. Neutrons are neutral.

But according to the rule, non metal ions are bigger than their neutral state. I don't know how this works.
Only when you are comparing anions to neutral states.

K+ has higher ionization energy than Cl- because K+ has more protons than Cl- so there are stronger attraction.
Correct

Here is a question for you to think about to see if you get this stuff...
Which is bigger Cl- or K+?






Answer is (DON'T LOOK 🙂):
Cl- because they have the same amount of electrons, but K+ has more protons so it will pull the electrons in more strongly making it smaller.
Hope it helps.

 

[dentista123]

Get this down because these are very "standardized test" kinds of questions. They draw out the knowledge of students. You might not have studied this question specifically, but you could have figured it out if you got it on the DAT. Be confident in your ability to derive reasonable explanations for problems that you have not seen.

 

[Omenino]

Of course Cl- is bigger since it has an extra electron on the outside

I was wondering which is bigger.
I think Cl- is smaller because it gains more electrons when the proton numbers are the same so wouldn't there be more attraction between proton and neutrons?

But according to the rule, non metal ions are bigger than their neutral state. I don't know how this works.

K+ has higher ionization energy than Cl- because K+ has more protons than Cl- so there are stronger attraction.

 

[jay47]

The guys ahead of me explained it correctly, but I just want to point out some things so you dont make this mistake again....



Here is a question for you to think about to see if you get this stuff...
Which is bigger Cl- or K+?






Answer is (DON'T LOOK 🙂):


Cl- because they have the same amount of electrons, but K+ has more protons so it will pull the electrons in more strongly making it smaller.
Hope it helps.

Excellent example question. We use one like this in the Kaplan class, and it highlights the point perfectly. Essentially, it's a ratio between protons and electrons.

 

[zoralsurgeon]

jay47 - your quote "If you think education is expensive, try ignorance." -Derek Bok is SO true. Never heard this before - I like it haha!

You all explained the concern very well, however. I don't think I can surpass the explanations lol...