Beryllium-9 is a stable isotope of beryllium. (i) State the meaning of the term stable. (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. $$ ^9_4 Be $$ Complete the sentence by putting a cross (X) in the box next to your answer. The number of neutrons in this nucleus is A 4 B 5 C 9 D 13 (iii) Which one of these symbols describes the nucleus of a different isotope of beryllium? Put a cross (X) in the box next to your answer.

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Beryllium-9 is a stable isotope of beryllium - Edexcel - GCSE Physics - Question 4 - 2013 - Paper 1

Question 4

Beryllium-9 is a stable isotope of beryllium. (i) State the meaning of the term stable. (ii) Beryllium-9 has an atomic number of 4 and a mass number of 9. A nucleu... show full transcript

Worked Solution & Example Answer:Beryllium-9 is a stable isotope of beryllium - Edexcel - GCSE Physics - Question 4 - 2013 - Paper 1

Step 1

State the meaning of the term stable.

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Answer

The term 'stable' means that the isotope does not emit (ionising) radiation or is not radioactive. In other words, it does not undergo radioactive decay.

Step 2

Complete the sentence by putting a cross (X) in the box next to your answer. The number of neutrons in this nucleus is

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Answer

For Beryllium-9, the number of neutrons can be calculated using the formula:

$ext{Number of Neutrons} = ext{Mass Number} - ext{Atomic Number}$

Thus:

$9 - 4 = 5$

Therefore, the correct answer is B (5).

Step 3

Which one of these symbols describes the nucleus of a different isotope of beryllium?

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Answer

The nucleus of a different isotope can be represented as either symbol provided, except for the isotope mentioned. Thus, put a cross (X) in the box next to the symbol that differs from $^9_4 Be$ . If provided symbols are:

A) $^6_4 Be$
B) $^8_4 Be$
C) $^9_4 Be$
D) $^9_5 Be$

The correct answer is either A, B or D depending on the actual symbols shown.

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