MEDIUMMCQ SINGLENEET ChemistryInorganic ChemistryPeriodic PropertiesAtomic and Ionic Radii
Among 3rd-row elements atomic size is maximum for
A.sodium✓ Correct
B.aluminium
C.magnesium
D.chlorine
Explanation
In general, the atomic size of elements decreases from left to right in a period due to the increase in the effective nuclear charge. Therefore, the order of atomic size is Cl < Al < Mg < Na. Hence, the sodium has the maximum atomic size in the third row.
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