Q40 / 160 · AP EAMCET 2004 · Chemistry

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
  • Correct answer
    C
    ${ }_{19} \mathrm{K}^{19}$ and ${ }_{20} \mathrm{Ca}^{40}$ are isotopes
  • D
    ${ }_9 \mathrm{F}^{19}$ and ${ }_{11} \mathrm{Na}^{24}$ are isotopes

Solution

Isotones are species which have equal number of neutrons. neutrons in ${ }_{19} \mathrm{~K}^{39}=39-19=20$ neutrons in ${ }_{20} \mathrm{Ca}^{40}=40-20=20$.

Hence, the correct answer is option: 'C'.

Relevant Questions