Edexcel Gcse Physics/additional Science - Unit P2 Physics For Your Future Page 21
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3421
(ii) Beryllium-9 has an atomic number of 4 and a
mass number of 9.
A nucleus of this isotope can be described
using this symbol.
9
Be
4
Complete the sentence by putting a cross (
)
in the box next to your answer. (1 mark)
The number of neutrons in this nucleus is
A
4
B
5
C
9
D
13
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