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Submitted by Anonymous on 24 October 2004 - 6:01pm.
I have an assignment, and I don't know where to find the answers. The textbook doesn't say anything, and I can't find information on the internet. If someone knows any of the answers, or knows a website with the information, I would greatly appreciate it.
Why does atomic radius generally decrease as you move across a period?
How and why does ionic radius change as you move across a period?
Why does ionization energy increase as you move across a period?
Why does electronegativity increase as you move across a period.
Thanks for all your help.
Think electrostatics.
As you go across a period, electrons are being placed in the same orbitals, so they don't intefere with each other too much.
As you go across a period, the number of protons also increases, making the nucleus more positively charged.
The electrons will therefore feel a greater attraction to the nucleus, and move in closer.
That general idea should put you on track to a decent answer.
Depending on the level of your course, you might want to include 'Effective Nuclear Charge', although I didn't learn of this concept until university, so don't worry about that if your not at uni yet.
That seems to help. Thanks!