TS EAMCET · Chemistry · Structure of Atom
Which of the following is not correct?
- A Nuclei of atoms participate in nuclear reactions
- B \({ }_{20} \mathrm{Ca}^{40}\) and \({ }_{18} \mathrm{Ar}^{40}\) are isotones
- C \(1 \mathrm{amu}\) of mass defect is approximately equal to \(931.5 \mathrm{MeV}\)
- D Uranium \(\left(\mathrm{U}^{238}\right)\) series is known as \((4 n+2)\) series
Answer & Solution
Correct Answer
(B) \({ }_{20} \mathrm{Ca}^{40}\) and \({ }_{18} \mathrm{Ar}^{40}\) are isotones
Step-by-step Solution
Detailed explanation
Isotones are the species having same number of neutrons. In \({ }_{20} \mathrm{Ca}^{40}\), number of neutrons is 20 and in \({ }_{18} \mathrm{Ar}^{40}\), number of neutrons \(=22\). So, \({ }_{20} \mathrm{Ca}^{40}\) and \({ }_{18} \mathrm{Ar}^{40}\) are not isotones.
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