Question

Group $16$ elements have lower value of first ionisation enthalpy as compared to group $15$ elements because

• A. half filled $p$-orbitals in group $15$ elements are more stable
• B. group $16$ elements have smaller size than group $15$ elements
• C. group $16$ elements contain double bond while group $15$ elements have triple bond
• D. group $16$ elements have more number of electrons in $p$-orbitals

Answer 1

Answer: (A)

half filled $p$-orbitals in group $15$ elements are more stable

Answer 2

Group $16$ elements have a lower value of first ionization enthalpy as compared to group $15$ elements. As group $15$ elements have half filled p-orbital due to which group $15$ have got extra stability.