Ijmb Model Questions Vol1 2025 Chemistry Question 2

Practice essay / theory question 2 from the 2025 Ijmb Model Questions Vol1 Chemistry examination. This question covers periodic table, electronic structure, periodic trends .

Ijmb Model Questions Vol1 2025 Chemistry Essay / Theory
Topics: periodic table electronic structure periodic trends
Question 2 IJMB_MODEL_QUESTIONS_VOL1 • 2025 • CHEMISTRY • essay

The diagram shows a Bohr model of an unknown element X. The nucleus is labelled X. Three concentric electron shells are drawn. The innermost shell contains 2 electrons, the second shell contains 8 electrons and the outermost shell contains 1 electron. The nucleus is annotated as containing 7 neutrons.

Question Parts

( a )
Determine the atomic number (Z) and the mass number (A) of element X.
( b )
Write the ground‑state electron configuration of X (i) using Bohr shell notation and (ii) using the modern orbital notation. State the chemical symbol of the element.
( c )
Sodium commonly loses its outermost electron to form an ion. (i) Write the ionic symbol of the ion formed and its charge. (ii) State the new electron configuration of the ion using modern notation.
( d )
Using periodic trends, compare the metallic character of element X with that of magnesium (Mg, Z = 12). State whether X is more metallic, less metallic, or about the same, and justify your answer with reference to their positions in the periodic table.

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About This Question

This is Ijmb Model Questions Vol1 2025 Chemistry Question 2. It is one of the essay questions from the 2025 Ijmb Model Questions Vol1 Chemistry examination.

The question covers periodic table, electronic structure, periodic trends .

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