Compare Cl to Cl- Image showing periodicity of valence s-orbital radius for the chemical elements as size-coded balls on a periodic table grid. Note that these elements are all found in the first column of the periodic table and that they are presented in descending order. Explain this discrepancy. for two reasons , it becomes smaller. To futher understand the concept. Cesium (Cs) has an atomic radius of 265. The atomic radius of a chemical element is the distance from the centre of the nucleus to the outermost shell of an electron. Sodium (Na) has an atomic radius of 186. Na has a larger atomic radius than Na+. The potassium atom has an extra electron shell compared to the sodium atom, which means its valence electrons are further from the nucleus, giving potassium a larger atomic radius. 2) a positive ion l;ike Na+1, pulls inward its shells of remaining electrons closer than a neutral atom like Na can.... your answer is. Empirical Atomic Radii. Since the boundary is not a well-defined physical entity, there are various non-equivalent definitions of atomic radius. Explore Interactive Periodic Table of Elements Atomic Radius Chart - Atomic Radius of all the elements in table chart. Number of Shells - Atomic/ionic size increases the number of electronic shells increases. As an example, potassium (K) has a larger average atomic radius (220 pm)than sodium (Na) does (180 pm). These values were taken from these sources: Cotton, F. A.; Wilkinson, G. … Before you can answer this question, you must first know two important factors affecting atomic and ionic radii: 1. Na+ has a smaller radius than Na. The nucleus has a stronger pull on the remaining electrons because more of its pull can distribute to the other outer shell electron. Since the Sodium loses an electron to form its cation. Click on 'Element Atomic Number', 'Element Symbol', 'Element Name' and 'Element Atomic Radius' headers to sort. This Atomic Radius chart table gives the Atomic Radius of all the elements of periodic table in pm. In sodium chloride, each sodium atom has lost an electron to become a sodium ion (charged atom) of unit positive charge.On the other hand, each chlorine atom has gained one electron to become a chloride ion of unit negative charge. 2. Al, P, Si, Na Answer It is known that on moving down the group, the ionic radii increases and on moving across the period from left to right, ionic radii decreases. Atomic radii used for this table were calculated values. The atomic radii of Na and Cl are 190 and 79 pm, respectively, but the distance between sodium and chlorine in NaCl is 282 pm. Are shielding effects on the atomic radius more pronounced across a row or down a group? Rubidium (Rb) has an atomic radius of 248. Na loses its outer shell which had 1 electron, to become Na+. 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