Atomic Structure (Edexcel GCSE Chemistry: Combined Science)

Exam Questions

57 mins11 questions
1
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1 mark

The atomic structure of an unknown element is shown below. 

1-1_q1-edexcel-gcse-mcq

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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2a3 marks

Atoms contain electrons, neutrons and protons.


i)
Draw one line to link each particle to its correct relative charge.
(2)
fig-q3ai-1cho-1f-paper-1-june-2018
ii)
Which of the following is the relative mass of a proton?
(1)
  A 0
  B 1 over 1837
  C
  D -1
2b1 mark

Argon is in group 0 of the periodic table.

Identify, using the periodic table, which of these elements is in the same period as argon.

  A bromine
  B iron 
  C magnesium 
  D xenon 
2c3 marks

Figure 4 shows the atomic number and mass number of two isotopes of argon.

isotope atomic number mass number
argon-38 18 38
argon-40 18 40

Figure 4

Describe the structure of an atom of argon-38 and of an atom of argon-40.

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31 mark

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

What was 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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4a3 marks

Chlorine has an atomic number of 17.

Figure 3 shows the arrangement of electrons in an atom of chlorine.

fig-3-q2a-1cho-1f-paper-1-nov-2020

Figure 3

i)
What is the electronic configuration of this atom?
(1)
  A 10.7
  B 17 
  C 2.8.7 
  D 7.8.2 

ii)
Explain, using Figure 3, why chlorine belongs to group 7 of the periodic table.
(2)
4b
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5 marks

The nucleus of an atom is made up of protons and neutrons.
Atoms of chlorine contain 17 protons.


Figure 4 shows some information about a proton, a neutron and an electron.

  relative mass relative charge
proton 1 +1
neutron 1 0
electron very small  -1

Figure 4

i)
Explain, using the information in Figure 3 and Figure 4, why atoms of chlorine have no overall charge.

(2)

ii)
Atoms of chlorine-37 have a mass number of 37.
Calculate the number of neutrons in atoms of chlorine-37.

(1)

number of neutrons = .................................................

iii)
There are two isotopes of chlorine, chlorine-35 and chlorine-37.
Explain the meaning of the term isotopes.

(2)

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51 mark

Chlorine–35 and chlorine–37 are isotopes. 

Which statement describes an isotope?

 
  A Atoms with the same number of protons and different numbers of electrons
  B Atoms with the same number of neutrons and different numbers of electrons
  C Atoms with the same number of protons and different numbers of neutrons
  D Atoms with the same number of neutrons and different numbers of protons

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6a
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3 marks

Higher Tier Only 

Titanium and iron are examples of transition metals.

Figure 6 shows the percentage abundance of each isotope in a sample of titanium.

fig-6-q6a-1cho-1h-paper-1-nov-2020

Figure 6

Calculate the relative atomic mass of titanium in this sample.

relative atomic mass = ......................................

6b4 marks

Iron, when heated in air, reacts with oxygen to form iron oxide.

i)
This reaction is an example of
(1)
  A crystallisation
  B distillation 
  C neutralisation 
  D oxidation 

ii)
The equipment shown in Figure 7 can be used to find the mass of oxygen that combines with iron.
fig-7-q6bii-1cho-1h-paper-1-nov-2020
Figure 7

Describe how the equipment shown in Figure 7 could be used to find the mass of oxygen that combines with 0.500 g of iron wool in a crucible and lid of known mass.

(3)

6c
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4 marks

2.24 g of iron combines with 0.96 g of oxygen to form an oxide of iron.

Determine the formula of this oxide of iron and use it to complete the balanced equation.

(relative atomic masses: Fe = 56.0, O = 16.0)

You must show your working.

balanced equation for the reaction is

................ Fe + ................O2 → ................................................

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