Created by StemPy LabConsider the six ions , , , , and as they occur in ionic crystals. Five of these ions have the same number of electrons, but one does not. Use the nuclear charge acting on a fixed electron cloud and the number of occupied shells to decide the sizes. Which is the correct order of increasing ionic radius?
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← Use Slater's rules with groups (1s), (2s,2p), (3s,3p), (3d), (4s,4p). Each other electron in the same group shields 0.35. For an ns or np electron, each electron in shell n-1 shields 0.85 and each deeper electron shields 1.00. For a d electron, every electron in a lower group shields 1.00. Higher groups do not shield. For manganese (Z = 25), let X = Zeff (a 3d electron of Mn²⁺) minus Zeff (a 4s electron of neutral Mn). Find 10X. The answer is an integer, rounded to the nearest whole number.The first ionisation enthalpies of the eight elements of one short period are listed in order of increasing atomic number, using the letters A to H. The values in kJ mol⁻¹ are: A 496, B 738, C 577, D 786, E 1000, F 1012, G 1251, H 1521. When the table was copied, the values of exactly one pair of elements were interchanged. Every other value is correct. Which statement fits the data? →
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