A) Nuclei of different elements can have the same number of neutrons
B) Every element has only two stable isotopes
C) Only one isotope of each element is stable
D) All isotopes of every element are radioactive
Correct Answer: A
Solution :
Nuclei of different elements having the same mass number are called isotones e.g., \[_{4}B{{e}^{9}}\]and \[_{5}{{B}^{10}}\]
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