CAIE A-Level Chemistry AS 1.2.2 The Notation X Questions

Practise reading isotope notation, identifying nucleon and proton numbers, and calculating neutrons as the difference between mass number and proton number.

Exam points

Use isotope notation to identify nucleon number and proton number, and calculate neutrons as mass number minus proton number.

[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.

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CAIE A-Level Chemistry AS 1.2.2 The Notation X Questions question 1