A) \[1{{s}^{2}},2{{s}^{2}}2{{p}^{6}},3{{s}^{2}}3{{p}^{6}}3{{d}^{10}},4{{s}^{2}}4{{p}^{6}}4{{d}^{10}}\], \[5{{s}^{2}},5{{p}^{6}}5{{d}^{6}},6{{s}^{2}}\]
B) \[1{{s}^{2}},2{{s}^{2}}2{{p}^{6}},3{{s}^{2}}3{{p}^{5}}\], \[5{{s}^{2}},5{{p}^{6}}5{{d}^{1}},6{{s}^{2}}\]
C) \[1{{s}^{2}},2{{s}^{2}}2{{p}^{6}},3{{s}^{2}}3{{p}^{6}}3{{d}^{10}},4{{s}^{2}}4{{p}^{6}}4{{d}^{10}}\], \[5{{s}^{2}}5{{p}^{6}}\]
D) \[1{{s}^{2}},2{{s}^{2}}2{{p}^{6}},3{{s}^{2}}3{{p}^{6}}3{{d}^{10}},4{{s}^{2}}4{{p}^{6}}4{{f}^{14}}\], \[5{{s}^{2}}5{{p}^{6}}5{{d}^{1}}\]
Correct Answer: C
Solution :
Key Idea: Convert these configurations to 2, 8, 18 scheme to find which of them has noble gas configuration that is 8 electrons in valence shell. [a] 2, 8, 18, 18,14,2 [b] 2, 8, 18, 18, 9,2 [c] 2, 8, 18, 18, 8 [d] 2, 8, 18, 16, 1 (configuration is wrong) < \[\because \] only [c] has 8 electrons in valence shell.
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