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Dinesh khalmaniya 1 Best Answer
Isosters are those atoms which have similar number of electrons in their valence shell. For example F and Cl. They have 7 electrons each in their outermost shell. In fact every group in Mendeleev's period table represent the members of Isosters group. Isosters could be also from different groups. For example F- is isoster with H-. Isoelectronic species are those atoms/ions having same electron numbers but with different nuclear charges