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Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Chapter

Atomic Structure

108 practice questions

Start practising (44 questions)

Topics covered

Practice questions

11–20 of 44 · Easy

  1. Question 11

    2 marks · Easy

    An atom has an atomic number of 9 and a mass number of 19. Calculate the number of neutrons in this atom. Show your working.

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  2. Question 12

    2 marks · Easy

    Explain why the atomic number is important in identifying an element.

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  3. Question 13

    3 marks · Easy

    Properties of Three Sub-Atomic Particles
    ParticleRelative massRelative charge
    A1+1
    B1/1836-1
    C10
    (a)

    Name particle A.

    [1 mark]
    (b)

    Name particle B.

    [1 mark]
    (c)

    State the position in the atom of particle C.

    [1 mark]
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  4. Question 14

    1 mark · Easy

    State what information the mass number of an atom gives you.

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  5. Question 15

    3 marks · Easy

    (a)

    Name the sub-atomic particle with a negative charge.

    [1 mark]
    (b)

    State the relative mass of a proton.

    [1 mark]
    (c)

    Where is the neutron found in the atom?

    [1 mark]
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  6. Question 16

    2 marks · Easy

    An atom has 13 protons and 14 neutrons. Calculate the mass number of this atom.

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  7. Question 17

    1 mark · Easy

    Naturally occurring boron is made up of two isotopes: 20% of its atoms have a mass number of 10, and the rest have a mass number of 11. What is the relative atomic mass of boron to the nearest whole number?

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  8. Question 18

    3 marks · Easy

    The element oxygen has three naturally occurring isotopes: ^{16}O, ^{17}O and ^{18}O.

    (a)

    State what is meant by the term 'isotope'.

    [1 mark]
    (b)

    State one thing that all isotopes of oxygen have the same.

    [1 mark]
    (c)

    State one way in which isotopes of oxygen differ.

    [1 mark]
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  9. Question 19

    2 marks · Easy

    A sample of element Y contains 75% of isotope ^{24}Y and 25% of isotope ^{25}Y. Calculate the relative atomic mass of Y. Give your answer to one decimal place.

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  10. Question 20

    2 marks · Easy

    Explain why isotopes of calcium all react in the same way, even though they have different numbers of neutrons.

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