Atomic Structure (OCR Gateway GCSE Chemistry)

Exam Questions

53 mins25 questions
11 mark

A number of scientists contributed to the development of the atomic model.

Which of these scientists discovered the electron?

  • Bohr

  • Dalton

  • Rutherford

  • Thomson

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21 mark

What is the typical size of the radius of an atom?

  • 10-2 m

  • 10-5 m

  • 10-10 m

  • 10-20 m

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31 mark

Two isotopes of neon are

begin mathsize 28px style Ne presubscript 10 presuperscript 22 end style and begin mathsize 28px style Ne presubscript 10 presuperscript 20 end style

The two isotopes of neon have different:

  • Charges

  • Numbers of electrons

  • Numbers of neutrons

  • Numbers of protons

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41 mark

In 1803 John Dalton suggested that all matter is made from atoms.

The electron was the first subatomic particle to be discovered by J.J. Thomson in 1897.

J.J. Thomson developed Dalton’s model to show the presence of electrons.

What was J.J. Thomson’s model called?

  • Bohr model

  • Particle model

  • Planetary model

  • Plum-pudding model

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51 mark

A sodium atom can be shown as:

space presubscript 11 presuperscript 23 Na

How many protons, neutrons and electrons are in a sodium atom?

  • 11 protons, 12 neutrons, 11 electrons

  • 11 protons, 11 neutrons, 12 electrons

  • 12 protons, 12 neutrons, 11 electrons

  • 12 protons, 11 neutrons, 11 electrons

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61 mark

A potassium isotope can be shown as:

straight K presubscript 19 presuperscript 39

What are the numbers of protons, neutrons and electrons in this potassium isotope?

  • 19 protons, 19 neutrons, 20 electrons

  • 19 protons, 20 neutrons, 19 electrons

  • 20 protons, 19 neutrons, 19 electrons

  • 20 protons, 20 neutrons, 19 electrons

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71 mark

Carbon-12 and carbon-14 are isotopes.

Which statement describes isotopes?

  • Atoms with the same number of protons but a different number of electrons.

  • Atoms with the same number of electrons but a different number of protons.

  • Atoms with the same number of protons but a different number of neutrons

  • Atoms with the same number of neutrons but a different number of protons.

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1
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1 mark

The atomic structure of an unknown element is shown below. 

atom

What is the atomic number and mass number for the unknown element?

  Atomic Number Mass Number
 A 6 11
 B 5 11
 C 5 6
 D 6 10

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    21 mark

    Niels Bohr was one scientist who contributed to the development of the atomic model. 

    What was his discovery?

    • An atom is a ball of positive charge with electrons scattered throughout it

    • An atom is mainly empty space 

    • Mass is concentrated at the centre of the atom called the nucleus

    • Electrons exist in shells and orbit the nucleus at specific distances

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    31 mark

    As the atomic model developed, protons, neutrons and electrons were discovered. 

    What is the correct order of discovery?

      First Second Third
     A Proton Neutron Electron
     B Proton Electron Neutron
     C Electron Proton Neutron
     D Electron Neutron Proton

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      41 mark

      What is the typical size of the radius of a nucleus of an atom?

      • 10-14 m

      • 10-12 m

      • 10-10 m

      • 10-8 m

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      51 mark

      A sodium atom can be shown as:

      begin mathsize 20px style Na presubscript 11 presuperscript 23 end style

      Sodium forms the ion Na+

      How many protons, neutrons and electrons are in a sodium ion?

      • 11 protons, 11 electrons, 12 neutrons 

      • 10 protons, 10 electrons, 12 neutrons

      • 11 protons, 10 electrons, 12 neutrons

      • 11 protons, 12 electrons, 12 neutrons

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      61 mark

      Ernest Rutherford's gold-foil experiment involved firing positively charged alpha particles at a thin sheet of gold foil. 

      One of his observations was that some of the alpha particles bounced straight back off the gold foil. 

      What did this prove?

      • The atom is mainly empty space

      • The atom has a positively charged nucleus 

      • The mass of the atom is concentrated in the nucleus 

      • The positive charges are spread throughout the atom 

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      7
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      1 mark

      The atomic radius of a hydrogen atom is 0.037 nm. 

      What is the radius in standard form? 

       

      • 3.7 x 10-1

      • 3.7 x 10-2

      • 3.7 x 10-3

      • 3.7 x 10-4

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      81 mark

      Chlorine- 35 and chlorine- 37 are isotopes. 

      Which statement describes an isotope?

      • Atoms with the same number of protons and different numbers of electrons

      • Atoms with the same number of neutrons and different numbers of electrons

      • Atoms with the same number of protons and different numbers of neutrons

      • Atoms with the same number of neutrons and different numbers of protons

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      91 mark

      Which statement best describes the structure of an atom?

      • A nucleus containing protons and neutrons, surrounded by electrons

      • A nucleus containing protons and electrons, surrounded by neutrons

      • A nucleus containing electrons and neutrons, surrounded by protons 

      • A nucleus containing protons, surrounded by neutrons and electrons

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      101 mark

      Whose atomic model was developed first? 

      • JJ Thompson

      • Ernest Rutherford

      • John Dalton

      • Niels Bohr

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      111 mark

      The diagram shows an atom of an element.

      q10-paper-1-nov-2020-ocr-gcse-chem

      What is the name of the element?

      • Boron

      • Beryllium

      • Fluorine

      • Neon

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      121 mark

      What is the approximate size of an atom?

      • 3 × 10–1 metres

      • 3 × 10–5 metres

      • 3 × 10–9 metres

      • 3 × 10–13 metres

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      131 mark

      The charge on an electron is −1.6 × 10−19 C.

      What is the charge on a proton?

      • −1.6 × 1019 C

      • −1.6 × 10−19 C

      • 1.6 × 10−19 C

      • 1.6 × 1019 C

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      141 mark

      Niels Bohr was involved in the development of the atomic model.

      Which of these statements describes his work?

      • He developed the idea of a nuclear atom.

      • He developed the plum-pudding model of the atom.

      • He stated that atoms were like tiny solid balls.

      • He stated that electrons exist in fixed energy levels.

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