A) The electronic configuration of \[Cr\] is \[[Ar]3{{d}^{5}}4{{s}^{1}}\].
B) The magnetic quantum number may have a negative value.
C) In silver atom 23 electrons have a spin of one type and 24 of the opposite type.
D) All of these
Correct Answer: D
Solution :
\[Cr(24)=1{{s}^{2}},2{{s}^{2}}2{{p}^{6}},3{{s}^{2}}3{{p}^{6}}3{{d}^{5}},4{{s}^{1}}=[Ar]\,3{{d}^{5}},4{{s}^{1}}\]For magnetic quantum number (m) negative value be possible. For p-subshell, \[l=1\] and \[m=-1,0,+1\] \[Ag(47)=1{{s}^{2}},2{{s}^{2}}2{{p}^{6}},3{{s}^{2}}3{{p}^{6}}3{{d}^{10}},4{{s}^{2}}4{{p}^{6}}4{{d}^{10}},5{{s}^{1}}\]Therefore 23 electrons have a species of one type and 24 of the opposite type.
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