$Gd^{3+}$ આયન $(Z = 64)$ ની ચુંબકીય ચાકમાત્રા ....... $B.M.$ છે
AIEEE 2012, Diffcult
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c Electronic configuration of $[ Gd ]^{3+}:[ Xe ] 4 f ^7$
Hence number of unpaired electron $n =7$
Hence, magnetic moment $=\sqrt{ n ( n +2)}=\sqrt{63}=7.9\,BM$
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