Which One of the Following Atoms Has the Largest Radius?

Answer

Atomic radius is the measure of the distance between the nucleus of the atom and the outer ring of electrons. Caesium has the largest atomic radius of 225 pm. Helium has the smallest atomic radius of 32 pm.
Reference:
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d.S. as O,Ne,F are in 2nd period and S and Cl are in 3rd period so S and Cl will be bigger than O,Ne and F because as period increases ,the no. of shells or principal quantum no '
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Of the elements you
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Francium.
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The atomic radii of the main group elements increase going down a group and decrease going across a period. In other words, the lower left corner of the periodic table has the largest
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