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Answer» atomic radius of the elements increases as one moves down the first group of the periodic table
atomic radius of the elements decreases as one moves across from left to right in the 2nd period of the periodic table
amongst isoelectronic species, smaller the positive charge on the cation, smaller is the IONIC radius
amongst isoelectronic species, greater the NEGATIVE charge on the anion, larger is the ionic radius. Solution :On moving from left to right right across a period. The proton number and magnitude of nuclear charge of elements increase GRADUALLY leading to corresponding decrease in the atomic radii of the elemennt. Again, on moviniig down a group, with increase in the atomic number of element, their atomic radii gradually decrease DUE to addition of new shells. for isoelectronicc ions, with decrease in positive charge of cations and with increase in negative charge of anions, ionic radii increase.
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