ReasoningModerate1 mark
Why is this element preferred?
Topic: Properties of lead shielding
Question wording verified against source paper
Answer
Exam answer
Lead is very dense and absorbs penetrating ionising radiation effectively.
Explanation
Its high density and atomic number make it a useful shielding material.
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An atom of lithium contains 3 electrons, 3 protons and 4 neutrons. Its mass number is:
(a) 3
(b) 4
(c) 7
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