A) Nuclei of atoms participate in nuclear reactions
B) \[_{20}C{{a}^{40}}\]and \[_{18}A{{r}^{40}}\] are isotones
C) 1 amu of mass defect is approximately equal to \[931.5\text{ }MeV\]
D) Uranium \[({{U}^{238}})\] series is known as \[(4n+2)\] series
Correct Answer: A
Solution :
Isotones are the species having same number of neutrons. In \[_{20}C{{a}^{40}},\] number of neutrons is 20 and in \[_{18}A{{r}^{40}},\] number of neutrons = 22, So, \[_{20}C{{a}^{40}}\]and \[_{18}A{{r}^{40}}\] are not isotones.
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