A) \[_{20}{{X}^{40}}{{,}_{21}}{{X}^{40}}\]
B) \[_{20}{{X}^{40}}{{,}_{20}}{{X}^{41}}\]
C) \[_{20}{{X}^{20}}{{,}_{41}}{{X}^{20}}\]
D) None
Correct Answer: B
Solution :
Isotopes are the atoms of an element which have same atomic number but different mass number.
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