Among the isoelectronic ions O 2 - , N 3 - , Mg 2 + , Na + , the ions with the least and the highest ionic radius are, respectively

Question

Among the isoelectronic ions O 2 - , N 3 - , Mg 2 + , Na + , the ions with the least and the highest ionic radius are, respectively, Mg 2 + , N 3 -, Mg 2 + , O 2 -, Na + , N 3 -, Na + , O 2 -

MARKS App · Accepted Answer

For isoelectronic species, N 3 - O 2 - Na + Mg 2 + Number of electrons 10 10 10 10 Number of protons 7 8 11 12 With increase in number of protons in the nucleus the electrons are more attracted towards nucleus, thereby causing the decrease in ionic radius. Order of ionic radius: Mg 2 + Na + O 2 - N 3 - .

	$N^{3 -}$	$O^{2 -}$	${Na}^{+}$	${Mg}^{2 +}$
Number of electrons	$10$	$10$	$10$	$10$
Number of protons	$7$	$8$	$11$	$12$

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