STD 11 - 3. Classification of elements and periodicity in properties — NEET STD 11 Science — Question
Gujarat BoardEnglish MediumSTD 11 ScienceNEETSTD 11 - 3. Classification of elements and periodicity in properties4 Marks
Question
Radius of the isoelectronic species
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Answer
b An isoelectronic series is a group of ions that all have the same number of electrons. For example, one isoelectronic series could include $O ^{2-}, F ^{-}, Na ^{+}, Mg ^{2+}$. These all have ten electrons.The number of protons, though, increases as atomic number increases, so nuclear charge increases. When we consider effective nuclear charge then, the ions of greater nuclear charge attract those ten electrons more strongly and pull them in more tightly. Therefore, the radii of the ions in an isoelectronic series decrease as nuclear charge (or atomic number) increases.
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