Ijmb Model Questions Vol1 2025 Chemistry Question 1

Practice essay / theory question 1 from the 2025 Ijmb Model Questions Vol1 Chemistry examination. This question covers Atomic Structure, Isotopes, Relative Atomic Mass .

Ijmb Model Questions Vol1 2025 Chemistry Essay / Theory
Topics: Atomic Structure Isotopes Relative Atomic Mass
Question 1 IJMB_MODEL_QUESTIONS_VOL1 • 2025 • CHEMISTRY • essay

The diagram shows two naturally occurring isotopes of a neutral element X. The nucleus of each isotope is illustrated with the number of protons (Z) and neutrons (N). The electron shells are drawn showing the distribution of electrons. The isotopic data are: - Isotope‑1: mass number 35, relative abundance 75 % - Isotope‑2: mass number 37, relative abundance 25 % The element has atomic number 17 (i.e., 17 protons).

Question Parts

( a )
State the atomic number and the symbol of the element.
( b )
Calculate the number of neutrons present in each isotope.
( c )
Write the ground‑state electron configuration of the element using the noble‑gas notation.
( d )
Determine the average (relative) atomic mass of the element from the isotopic data given.
( e )
Explain why the calculated average atomic mass is not a whole number, relating your answer to the concept of isotopic abundance.

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About This Question

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

The question covers Atomic Structure, Isotopes, Relative Atomic Mass .

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