CAIE A-Level Chemistry 1.2.2 The notation x

Practise interpreting isotope notation to connect mass number, proton number, neutron number and electronic arrangement in tables.

Exam points

[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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