The periodic table
2 marks · EasyGive the number of neutrons in a bromine atom with mass number 79 and atomic number 35.
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44 (±0)
Common mistakes: 79 + 35 = 114
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Marking points
M1 · 1 mark · Shows correct calculation of 79 - 35.
A1 · 1 mark · Correctly gives 44.
Worked solution