Gce Model Questions Vol1 2025 Chemistry Question 1

Practice essay / theory question 1 from the 2025 Gce Model Questions Vol1 Chemistry examination. This question covers Atomic Structure .

Gce Model Questions Vol1 2025 Chemistry Essay / Theory
Topic: Atomic Structure
Question 1 GCE_MODEL_QUESTIONS_VOL1 • 2025 • CHEMISTRY • essay
Gce Model Questions Vol1 2025 Chemistry Question 1 diagram

The diagram shows a simplified Bohr model of an unknown element X.

Question Parts

( a )
Identify the element (provide its name and chemical symbol).
( b )
Write the mass number of the most abundant isotope of X shown in the diagram.
( c )
State the ground‑state electron configuration of X using the Aufbau principle (write in the form 1s² 2s² 2p⁶ …).
( d )
X forms a mono‑atomic cation X⁺ by loss of one electron. Assuming the radius of the neutral atom is 140 pm and that the effective nuclear charge increases by 0.5 units for each electron removed, estimate the ionic radius of X⁺ using the proportionality r ∝ 1/Z_eff.

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About This Question

This is Gce Model Questions Vol1 2025 Chemistry Question 1. It is one of the essay questions from the 2025 Gce Model Questions Vol1 Chemistry examination.

The question covers Atomic Structure .

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