CAIE IGCSE Physics 5.1.2.7 Relationship Between the Proton Number Questions

Relate proton number to nuclear charge in CAIE IGCSE Physics by using neutral-atom electron counts to compare nuclei while keeping atom and nucleus charges distinct.

Exam points

Relate a nucleus's positive charge to its proton number, since each proton has relative charge +1 and neutrons have no charge.
For neutral atoms, use equal electron and proton counts to compare which nucleus is more positively charged, distinguishing this from the atom's zero overall charge.

[Maximum number: 1]

The notation represents the nucleus of a gold atom.

\section*{197 \\ ${ }_{9}^{7} \mathrm{Au}$ }

The relative charge on a proton is +1 .
What is the relative charge on the gold nucleus?

+79

+118

+197

+276

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CAIE IGCSE Physics 5.1.2.7 Relationship Between the Proton Number Questions question 1