CAIE IGCSE Physics: Proton & Nucleon Numbers Question Bank

Practise reading proton and nucleon numbers from nuclide symbols, calculating neutron counts and completing the composition of neutral atoms or nuclei.

Exam points

identify Z as proton number and A as total nucleon number in a nuclide symbol
calculate the number of neutrons as A - Z and the nuclear charge from the proton count
for a neutral atom, set electron number equal to proton number and locate each particle correctly

[Maximum number: 2]

(a)

A nucleus of technetium-99 $\left({ }_{43}^{99} \mathrm{Tc}\right)$ emits only a $\gamma$ -ray.

State any effect of this on

[ 2 ]

(i)

the proton number of the nucleus,

[ 1 ]

(ii)

the nucleon number of the nucleus.

[ 1 ]

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5.1.2.3—Terms proton number (atomic number) Z question 1

Question (a)

Question (i)

Question (ii)