Gce Model Questions Vol1 2019 Chemistry Question 1

Practice essay / theory question 1 from the 2019 Gce Model Questions Vol1 Chemistry examination. This question covers Atomic Structure .

Gce Model Questions Vol1 2019 Chemistry Essay / Theory
Topic: Atomic Structure
Question 1 GCE_MODEL_QUESTIONS_VOL1 • 2019 • CHEMISTRY • essay
Gce Model Questions Vol1 2019 Chemistry Question 1 diagram

The diagram shows a Bohr model of an atom with atomic number Z = 15. The nucleus is labelled “P” and the concentric shells are labelled K, L and M containing 2, 8 and 5 electrons respectively.

Question Parts

( a )
Write the ground‑state electron configuration of the atom using the Aufbau principle (show the distribution of electrons in the shells).
( b )
Using Slater’s rules (simplified) estimate the effective nuclear charge (Zₑff) felt by an outer‑most 3p electron and then calculate, with the Bohr‑type expression \(E = -13.6\,\dfrac{Z_{eff}^{2}}{n^{2}}\) eV, the energy required to remove that electron (first ionisation energy). Show all steps.
( c )
The experimental first ionisation energy of phosphorus is 10.5 eV. Discuss at least two reasons why the value obtained in part (b) differs markedly from the experimental value.

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About This Question

This is Gce Model Questions Vol1 2019 Chemistry Question 1. It is one of the essay questions from the 2019 Gce Model Questions Vol1 Chemistry examination.

The question covers Atomic Structure .

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