Atomic Structure (OCR Gateway GCSE Chemistry)

Exam Questions

53 mins25 questions
13 marks

All elements are made of atoms.
Atoms are made of subatomic particles.

i)
Complete the labels on the diagram of an atom.

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[2]

ii)
Atoms have no overall charge.

Explain why.

Use ideas about subatomic particles in your answer.
[1]

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2a1 mark

Look at the diagram of an atom.

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Which particles are present in the charge cloud?

2b1 mark

Which two particles make up the nucleus?

............................................. and .............................................

2c2 marks

Most of the mass of an atom is in the nucleus.

Explain why.

2d2 marks

Look at these two atoms of chlorine.

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What is the relationship between these two atoms of chlorine?

Explain your answer.

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1a
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4 marks

Look at Table 24.1.

It shows information about some atoms and ions.

Particle Atomic number Mass number Number of protons Number of neutrons Number of electrons Electronic structure
A 11 23 11 .............. 11 2.8.1
B 23 19 9 10 9 ..............
C .............. 37 17 .............. 17 2.8.7
D 13 27 .............. .............. 10 2.8


Table 24.1

Complete the missing information in Table 24.1.

1b2 marks

Particle A is a metal atom, particle D is an ion.

Explain why.

1c4 marks

Element C has the electronic structure 2.8.7.

What does this electronic structure tell you about the position of element C in the periodic table?

Explain your answer

1d2 marks

Complete the table below to give information about protons, neutrons and electrons.

  Charge Mass in atomic
mass units
proton ......................... 1
neutron ......................... .........................
electron negative .........................

1e1 mark

Rutherford was a scientist who helped to develop the atomic model.


State how Rutherford’s work contributed to the development of the atomic model.

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2a1 mark

Look at the information about two atoms of chlorine.

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The atomic number of chlorine is 17.

What is meant by atomic number?

2b1 mark

These two atoms of chlorine are isotopes.

Explain why these two atoms of chlorine are isotopes.

2c
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4 marks

Look at the information about other atoms and ions.

Atom or ion Atomic
number
Mass
number
Number of
protons
Number of
neutrons
Number of
electrons
Electronic
structure
S 16 32 .............. 16 16 ..............
B 5 11 5 .............. .............. 2.3
F 9 19 ............. .............. 10 2.8
Li+ 3 7 3 4 .............. ..............

Complete the table.

2d4 marks
i)
The electronic structure of sodium is 2.8.1. The electronic structure of oxygen is 2.6.
Sodium and oxygen react together to make sodium oxide.

Sodium oxide is an ionic compound.

Draw ‘dot and cross’ diagrams to show the ions made when sodium reacts with oxygen.

Show the charges on the ions.

[3]

ii)
What is the formula of sodium oxide?

[1]

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