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Q.

Which of the following species are isotopic as well as isoelectronic?

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a

$^{24} {Mg}^{+ 2},^{25} Mg$

b

$^{40} {Ca}^{+ 2},^{40} Ar$

c

$^{23} {Na}^{24} {Na}^{+}$

d

$^{39} K^{+},^{40} K^{+}$

answer is B.

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Detailed Solution

$K^{+}$ in (B) contains 1g electrons. They are also isotopes since they share the same atomic number but have different masses.

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