Classical atomic models

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Question

Find number of pairs in which difference between total number of electrons is zero.
$(N_{2} O, {CO}_{2}) ({NO}_{2}^{+}, {CO}_{2}) ({NH}_{3}, {PH}_{4}^{+}) ({Cr}^{6 +}, {Sc}^{3 +}) ({Se}^{2 -}, {Br}^{-}) ({NO}_{2}^{+}, O_{3}) (i) (ii) (iii) (iv) (v) (vi)$

Moderate

Solution

Isoelectronic species are (i). (ii), (iv) and (v)

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