CAIE A-Level Chemistry AS 1.2 Isotopes Questions

Practise defining isotopes and linking neutron-number differences to physical properties, abundance and relative atomic mass.

Exam points

define isotopes as atoms of the same element with equal proton number but different neutron numbers
explain identical chemical properties through the same electron configuration
use isotopic mass and percentage abundance to calculate or interpret relative atomic mass

Covered syllabus points

1.2.1—Terms: isotope 1.2.2—The notation x 1.2.3—Isotopes of the same element have the same 1.2.4—Isotopes of the same element have different

[Maximum number: 1]

The table shows the numbers of protons, neutrons and electrons in four different particles, W, X, Y, and Z.

Table for Question 1 — CAIE A-Level Chemistry AS

Which pair represents the atoms of two isotopes of the same element?

W and Y

W and Z

X and Y

X and Z

[Maximum number: 3]

An isotope of copper has a relative isotopic mass of 65 .

Complete Table 1.2 for an atom of copper-65.

Table 1.2

Correct completed table:

isotope	atomic number	nucleon number	number of neutrons	electronic arrangement
copper-65	29	65	65-29=36	$1\mathrm{s}^{2}2\mathrm{s}^{2}2\mathrm{p}^{6}3\mathrm{s}^{2}3\mathrm{p}^{6}3\mathrm{d}^{10}4\mathrm{s}^{1}$

M1: 29 and 65.
M2: nucleon number - atomic number;
allow ECF from M1.
M3: electronic arrangement.

[Maximum number: 1]

Which statements are correct when referring to the two common isotopes of chlorine?
1 The isotopes have different masses.
2 The isotopes have different numbers of nucleons.
3 The isotopes have the same chemical reactions.

1, 2 and 3 are correct

1 and 2 only are correct

2 and 3 only are correct

1 only is correct

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Covered syllabus points

Question 1

Question 2

Question 3