CAIE IGCSE Physics Proton Number and Nuclear Charge
Practise linking proton number to positive nuclear charge, using nuclide notation or neutral-atom diagrams to compare nuclei and electron counts.
- Syllabus
- 2026–2028
- Course
- Physics 0625
Exam points
- calculate a nucleus's relative charge as +Z because each of its Z protons has charge +1
- compare neutral-atom diagrams by matching electron count to proton count and nuclear charge
5.1.2.7—Relationship between the proton number question 1
[Maximum number: 1]
The notation represents the nucleus of a gold atom.
\section*{197 \\ 97Au}
The relative charge on a proton is +1 .
What is the relative charge on the gold nucleus?
A
+79
B
+118
C
+197
D
+276
A
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