while going across the period, atomic size decreases due to addition of electrons in the same shell, but wont that increase the repulsion between the electrons which will lead to increase in the atomic radius?

Asked by Saurabh Rai | 20th Nov, 2010, 12:00: AM

Expert Answer:

Dear Student
 
The atomic size decreases because there is an increase in positive charge in the nucleus as we go from left-to-right. Each time we go over an element it has one more electron and proton added to the principal energy level, so the nucleus pull increases and it holds the valence electron in tighter. The effective nuclear charge overcomes the electron-electron repulsion.
 
 
We hope that clarifies your query.
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Answered by  | 21st Nov, 2010, 09:02: AM

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