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Chemistry
Which element has the smallest atomic radius? calcium potassium scandium titanium
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 The element  that has the smallest  atomic radius is  titanium


          explanation

  • Calcium,potassium,  scandium and titanium are in  period  4 in the periodic table.
  • Generally  the atomic   radius    decreases  across the period (from the left to the right) .  This is because  across the period  there is increase  in nuclear charge  which  make electrons been strongly attracted to the nuclear.
  • Titanium is in atomic number 22 thus it has  more nuclear  charge  that  calcium,potassium and  scandium therefore  titanium has the  smallest atomic radius.
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