ATOMS AND RADIOACTIVITY
3 marks · NormalA radioactive isotope of beryllium, , decays by emitting a beta particle.
Write the nuclear equation for this decay, showing the daughter nucleus and all radiation emitted.
Describe what happens to the atomic and mass numbers of beryllium in this process.
Work this out on paper, then compare with the answer and worked solution below. With a free account you can submit written answers for marking.
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(a) · must show ,
(b) Atomic number increases by 1; mass number stays the same · must show Atomic +1, Mass unchanged
Common mistakes: Wrong atomic number changes; Wrong radiation symbol
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Marking points
M1 (a) · 1 mark · Correct daughter symbol and values in nuclear equation.
A1 (a) · 1 mark · Correct symbol for emitted beta particle.
B1 (b) · 1 mark · Atomic number increases by 1, mass number unchanged.
Worked solution
a)
b) Atomic number increases by 1, mass number stays the same.