![]() ![]() Which element has a larger atomic radius sodium or aluminum?Īnswer Expert Verified You see the size of the atom decreases as we move from left to right in a period. The increased effective nuclear charge tends to decrease atomic radii across the Period from left to right. While aluminum has more electrons, valence electrons are known to shield each other very imperfectly. What has a bigger atomic radius sodium or aluminum?Īluminum has greater nuclear charge. Thus, the electrons in the outermost shell of Cl experience a stronger attraction toward the nucleus (because the nucleus of Cl has a greater charge). However, one of the main reasons why Na has a larger atomic radius than Cl is because Cl has more protons, though they both are filling the n=3 shell. Why does sodium have a larger atomic radius than chlorine? Sodium-ion has 10 electrons as sodium atom loses one electron to form sodium ion. Na+ is smaller than Na atom because: Cations of a given element have a smaller radius than the neutral atom so that Na+ will decrease in size compared with the Na atom. ![]() Hence, sodium will have a larger radius than phosphorus. Thus, the nuclear force of attraction will be more in case of phosphorus. Or also, the sodium’s atomic number is 11 whereas phosphorus’s atomic number is 15. Why sodium has the largest atomic radius?Īlong a period, atomic radius decreases as the nuclear force of attraction increases.
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