A-LevelChemistryAtomic structure9701/12 · Oct/Nov 2012 · Q21 Mark

Use of the Data Booklet is relevant to this question. The 68Ge isotope is medically useful because it undergoes a natural radioactive process to give a gallium isotope, 68Ga, which can be used to detect tumours. This transformation of 68Ge occurs when an electron enters the nucleus, changing a proton into a neutron. Which statement about the composition of an atom of the 68Ga isotope is correct?

AIt has 4 electrons in its outer p subshell.

BIt has 13 electrons in its outer shell.

CIt has 37 neutrons.

DIts proton number is 32.

✓ Correct answer

C: It has 37 neutrons.

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Topic: Atomic structure, A-Level Chemistry (syllabus 9701). Multiple choice, 1 mark.
Source: A-Level Chemistry, Oct/Nov 2012 Paper 1 Variant 2, question 2.

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