Question:

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

Updated On: Jul 6, 2022

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

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The Correct Option is A

Solution and Explanation

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.

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Notes on p -Block Elements

Concepts Used:

P-Block Elements

P block elements are those in which the last electron enters any of the three p-orbitals of their respective shells. Since a p-subshell has three degenerate p-orbitals each of which can accommodate two electrons, therefore in all there are six groups of p-block elements.
P block elements are shiny and usually a good conductor of electricity and heat as they have a tendency to lose an electron. You will find some amazing properties of elements in a P-block element like gallium. It’s a metal that can melt in the palm of your hand. Silicon is also one of the most important metalloids of the p-block group as it is an important component of glass.

P block elements consist of:

Group 13 Elements: Boron family
Group 14 Elements: Carbon family
Group 15 Elements: Nitrogen family
Group 16 Elements: Oxygen family
Group 17 Elements: Fluorine family
Group 18 Elements: Neon family