Group 15 Elements - Properties Quiz

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Questions and Answers

What is the electronic configuration of the group 15 elements?

  • ns^2 np^5
  • ns^2 np^3 (correct)
  • ns^2 np^2
  • ns^2 np^4

Why is there only a small increase in covalent radius from As to Bi?

  • Increase in electronegativity
  • Decrease in atomic size
  • Presence of d and f orbitals (correct)
  • Reduction in ionization energy

How does the ionisation enthalpy of group 15 elements compare with group 14 elements in the same period?

  • Greater in group 15 (correct)
  • Similar to group 14
  • Much lower in group 15
  • Equal in both groups

What trend is observed in the ionisation enthalpy as one moves down the group?

<p>It decreases gradually (D)</p> Signup and view all the answers

What can be said about the covalent and ionic radii in group 15 as you go down the group?

<p>They increase in size (A)</p> Signup and view all the answers

What causes the extra stability of the electronic configuration in group 15 elements?

<p>Partially filled p orbitals and completely filled s orbitals (C)</p> Signup and view all the answers

Which factor contributes to the decrease in ionisation enthalpy down the group 15 elements?

<p>Increase in atomic size (D)</p> Signup and view all the answers

Why is the covalent radius increase from N to P considerable, while from As to Bi it is only small?

<p>Due to the presence of filled inner orbitals in heavier members (C)</p> Signup and view all the answers

Which of the following accurately describes the order of ionisation enthalpies in group 15 elements?

<p>∆ i H 1 &lt; ∆ i H 2 &lt; ∆ i H 3 (B)</p> Signup and view all the answers

How does the presence of half-filled p orbitals affect the ionisation enthalpy compared to group 14 elements?

<p>It results in much greater ionisation enthalpy (A)</p> Signup and view all the answers

Flashcards

Valence Shell Electronic Configuration of Group 15

The electrons in the outermost energy level of an atom that are involved in chemical bonding. For group 15 elements, it's ns²np³.

Ionization Enthalpy in Group 15

The measure of how easily an atom can lose an electron. It decreases down group 15 due to increasing atomic size.

Covalent Radius in Group 15

The distance between the center of an atom and its outermost electron. It increases down the group but shows a smaller increase from As to Bi due to filled d and f orbitals.

Ionization Enthalpy of Group 15 vs Group 14

Group 15 elements have a higher ionization enthalpy compared to group 14 elements in the same period because of their half-filled p orbital configuration and smaller size.

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Successive Ionization Enthalpies

The energy required to remove successive electrons from an atom. Each subsequent ionization enthalpy is higher than the previous one (∆iH1 < ∆iH2 < ∆iH3).

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What is the valence shell electronic configuration of Group 15 elements?

The outermost energy level of an atom that contains the electrons involved in chemical bonding. For Group 15 elements, it's ns²np³. This configuration makes the elements extra stable.

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What is covalent radius and how does it change in Group 15?

The distance between the center of two bonded atoms. It generally increases down the group, but there's a smaller increase from As to Bi due to filled d and f orbitals in heavier members.

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What is ionization enthalpy and how does it vary in Group 15?

The energy required to remove one electron from a neutral atom in its gaseous state. It generally decreases down the group due to an increase in atomic size.

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Why do Group 15 elements have higher ionization enthalpy than Group 14 elements?

Group 15 elements have a higher ionization enthalpy compared to Group 14 elements in the same period because of their half-filled p orbital configuration and smaller size.

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What are successive ionization enthalpies and what is their trend?

The energy required to remove successive electrons from an atom. It generally increases with each successive ionization, following the order ∆ i H 1 < ∆ i H 2 < ∆ i H 3.

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Study Notes

Group 15 Elements - Physical and Chemical Properties

  • Valence shell electronic configuration: ns2np3
  • Stable electronic configuration: s orbital completely filled, p orbitals half-filled, contributing to extra stability.
  • Covalent and ionic radii increase down the group.
  • Significant covalent radius increase from nitrogen (N) to phosphorus (P).
  • Smaller covalent radius increase from arsenic (As) to bismuth (Bi) due to filled d and/or f orbitals in heavier elements.
  • Ionization enthalpy decreases down the group due to increasing atomic size.
  • High ionization enthalpy compared to Group 14 elements in the same period due to stable half-filled p orbitals and smaller size.
  • Successive ionization enthalpies increase predictably: ∆iH1 < ∆iH2 < ∆iH3

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