Question

Assertion :Nuclide Al${}_{13}^{27}$ is less stable than Ca${}_{20}^{40}$. Reason: Nuclide having odd number of protons and neutrons, are generally unstable.

• A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.
• B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.
• C. Assertion is correct but Reason is incorrect.
• D. Both Assertion and Reason are incorrect.

Answer 1

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.

$Assertion$

$Nuclide{Al}_{13}^{27}$ is less stable than ${Ca}_{20}^{40}$

Nuclide Al is less stable compound compared to Ca due to the fact that Al contains an odd number of protons and neutrons while Ca contains even number of protons and neutrons.
The nucleus of an atom can be represented as:
${}_Z^{A}X$

Where:

• A= atomic masses (number of protons+neutrons)
• Z= atomic number (number of protons)
• X= chemical symbol (as shown on the periodic table)
  When the nucleus of an atom possesses either too many or too few neutrons compared to the number of protons, it becomes unstable.
  $Reason$
  Nuclide having odd numbers of protons and neutrons are generally unstable.
  
• Properties of a nucleus depend on evenness or oddness of its atomic number Z, neutron number N and, consequently of their sum, the mass number A. Most notably, the oddness of both Z and N tends to lower the nuclear binding energy, making odd nuclei, generally, less stable.
  Both Assertion and reasons are correct and Reason is the correct explanation for Assertion.