Igcse Model Questions Vol1 2024 Chemistry Question 1

Practice essay / theory question 1 from the 2024 Igcse Model Questions Vol1 Chemistry examination. This question covers Atomic structure, Isotopes, Relative atomic mass .

Igcse Model Questions Vol1 2024 Chemistry Essay / Theory

Topics: Atomic structure Isotopes Relative atomic mass

Question 1 IGCSE_MODEL_QUESTIONS_VOL1 • 2024 • CHEMISTRY • essay

Igcse Model Questions Vol1 2024 Chemistry Question 1 diagram

The diagram shows two isotopes of a fictional element X. Isotope X‑35 has a relative abundance of 75 % and a mass of 34.969 u. Isotope X‑37 has a relative abundance of 25 % and a mass of 36.966 u. In each nucleus the protons are shown as red spheres and the neutrons as blue spheres; the number of protons is the same for both isotopes.

Question Parts

( a )

State the atomic number (Z) of element X.

( b )

Calculate the number of neutrons in each isotope.

( c )

Determine the average atomic mass of element X to three decimal places.

( d )

Explain why the average atomic mass is not a whole number even though the mass numbers of the isotopes are whole numbers.

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About This Question

This is Igcse Model Questions Vol1 2024 Chemistry Question 1. It is one of the essay questions from the 2024 Igcse Model Questions Vol1 Chemistry examination.

The question covers Atomic structure, Isotopes, Relative atomic mass .

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