A student in a Trinidad laboratory is studying the element aluminium, which is extracted from bauxite ore mined in Jamaica. The atomic number of aluminium is 13 and its mass number is 27. How many neutrons are present in one atom of aluminium?

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Question

A student in a Trinidad laboratory is studying the element aluminium, which is extracted from bauxite ore mined in Jamaica. The atomic number of aluminium is 13 and its mass number is 27. How many neutrons are present in one atom of aluminium?

Accepted Answer

14 — Award 1 mark for correct calculation: number of neutrons = mass number − atomic number = 27 − 13 = 14. A is incorrect — this is the number of protons/electrons. C is incorrect — this is the mass number, not the neutron count. D is incorrect — this would be the sum of mass number and atomic number.

Answer

40

Answer

27

Answer

14

Answer

13

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