AP EAMCET · Chemistry · Structure of Atom
Which of the following is correct?
- A \({ }_1 \mathrm{H}^1\) and \({ }_2 \mathrm{He}^3\) are isotopes
- B \({ }_6 \mathrm{C}^{14}\) and \({ }_7 \mathrm{N}^{14}\) are isotopes
- C \({ }_{19} \mathrm{K}^{19}\) and \({ }_{20} \mathrm{Ca}^{40}\) are isotopes
- D \({ }_9 \mathrm{F}^{19}\) and \({ }_{11} \mathrm{Na}^{24}\) are isotopes
Answer & Solution
Correct Answer
(C) \({ }_{19} \mathrm{K}^{19}\) and \({ }_{20} \mathrm{Ca}^{40}\) are isotopes
Step-by-step Solution
Detailed explanation
Isotones are species which have equal number of neutrons. neutrons in \({ }_{19} \mathrm{~K}^{39}=39-19=20\) neutrons in \({ }_{20} \mathrm{Ca}^{40}=40-20=20\).
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