How Does Atomic Radii Change Across the Periodic Table?

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SUMMARY

Atomic radii decrease from left to right across the periodic table due to the increase in nuclear charge as the number of protons increases. This increase in protons results in a stronger attractive force on the electrons, causing them to be pulled closer to the nucleus. Although the number of electrons also increases, their repulsive forces do not counterbalance the stronger pull from the protons, leading to a reduction in atomic radius.

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  • Understanding of atomic structure and electron configuration
  • Knowledge of periodic trends in chemistry
  • Familiarity with concepts of nuclear charge and electron shielding
  • Basic grasp of atomic theory and quantum mechanics
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  • Research the concept of nuclear charge and its effects on atomic structure
  • Explore electron shielding and its role in atomic radii
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johncena
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How does atomic radii decrease when we move left to right in a periodic table? Though the nuclear charge increase as a result of increase in number of protons,the same increase is occurring in number of electrons.
 
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All of your statements are correct. However, the increased number of protons pull more on each electron, whether or not there are more electrons around the atom. So the electrons get closer together.

So, there are more protons in the nucleus to pull on the electrons, and the electrons aren't exactly pushing each other outward with as much strength as the protons are pulling the orbitals inward, so the radius gets smaller.
 

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