Physics 0625 · IGCSE · The nuclear model of the atom

The nuclear model of the atom — practice question

A neutral atom of argon-40 $\left(^{40}_{18}\text{A}\right)$ is compared with a neutral atom of potassium-39 $\left(^{39}_{19}\text{K}\right)$. Which atom contains more electrons, and which atom contains more protons?

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