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  • Do you know what is atomic radius?
  • Good job! That's the right answer.
  • Atomic radius just like distance between atomic outer shell, and atomic nuclears
  • Do you know something else about atomic radius?
  • I also heard we can know about atomic radius from perioadic table.
  • So the atomic radius of carbon is less than oxygen.
  • You're right! But the periodic trend of the atomic radius in the same period are decreasing . That's because the attraction will increasing if an atom has more electrons.
  • Why?
  • By the way, the trend of the atomic radius in the same group will increase as the number of shells increase.
  • That's because the size of atom will become bigger if it has more electron shells.
  • Thanks, I got you, I just need to remember the atomic radius will decrease left to right, and will increase up to down.
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