Sun November 04, 2012 By:

why does atomic size decreases when we go left to right in a periodic table though atomic number increases?

Expert Reply
Tue November 06, 2012
As we go from left to right in a period, the atomic size or atomic radius increases with increase in atomic number. Increase in atomic number leads to an increase in the number of protons and electrons in the atoms.Due to the large nuclear charge (positive charge on the nucleus), the electrons are pulled in more close to the nucleus and the size of atom decreases.
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