Igcse Model Questions Vol1 2018 Chemistry Question 1

Practice essay / theory question 1 from the 2018 Igcse Model Questions Vol1 Chemistry examination. This question covers Atomic structure, Isotopes, Ions, Electron configuration .

Igcse Model Questions Vol1 2018 Chemistry Essay / Theory

Topics: Atomic structure Isotopes Ions Electron configuration

Question 1 IGCSE_MODEL_QUESTIONS_VOL1 • 2018 • CHEMISTRY • essay

The diagram shows a neutral atom of chlorine (Cl).

Question Parts

( a )

State the atomic number, mass number and the number of electrons in the atom.

( b )

Write the ground‑state electron configuration for this atom using the Aufbau principle.

( c )

The atom gains one electron to form an anion. Explain how the electron arrangement changes and state the charge on the ion.

( d )

Two isotopes of chlorine are shown: one with mass number 35 and another with mass number 37. If the natural abundances are 75 % for mass 35 and 25 % for mass 37, calculate the average atomic mass of chlorine.

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About This Question

This is Igcse Model Questions Vol1 2018 Chemistry Question 1. It is one of the essay questions from the 2018 Igcse Model Questions Vol1 Chemistry examination.

The question covers Atomic structure, Isotopes, Ions, Electron configuration .

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