Physics · May / June 2023 · Paper 12 · Question 35
5054The nucleus
The only stable isotope of gold, Au, has 79 protons and 118 neutrons in a nucleus of an atom. How many elecrons are there in a neutral atom of this isotope?
- A39
- B79
- C118
- D197
As printed in the paper
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Correct answer: B. 79
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