A) Ce
B) Cs
C) Cu
D) Cr
Correct Answer: A
Solution :
Copper and chromium are d-block element. Cesium (Cs) is a S-block element. Cerium (Ce) is a\[f-\]block element. Its atomic number is 58 and electronic configuration is as: \[Ce(Z=58):[X]\,4{{f}^{1}}5{{d}^{1}}6{{s}^{2}}\]
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