Periodic Classification and Periodic Properties 2 Question 16
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16. Which of the following has the maximum number of unpaired electrons?
======= ####16. Which of the following has the maximum number of unpaired electrons?
3e0f7ab6f6a50373c3f2dbda6ca2533482a77bed (a) $\mathrm{Mg}^{2+}$
(b) $\mathrm{Ti}^{3+}$
(c) $\mathrm{V}^{3+}$
(d) $\mathrm{Fe}^{2+}$
$(1996,1 \mathrm{M})$
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Answer:
Correct Answer: 16. (b)
Solution:
- $\mathrm{Mg}^{2+}=1 s^{2} 2 s^{2} 2 p^{6}=$ no unpaired electron
$\mathrm{Ti}^{3+}=1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 3 d^{1}=$ one unpaired electron
$\mathrm{V}^{3+}=1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 3 d^{2}=$ two unpaired electrons
$\mathrm{Fe}^{2+}=1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 3 d^{6}=$ four unpaired electrons
