A) \[1{{s}^{1}}\]
B) \[2{{s}^{2}}\]
C) \[2{{s}^{1}}\]
D) \[1{{s}^{2}}\]
Correct Answer: A
Solution :
Atomic number of deuterium = 1; \[_{1}{{D}^{2}}\to 1{{s}^{1}}\]
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