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Edexcel IGCSE Chemistry C Atomic Structure Questions

Practise interpreting atomic structure, isotope data and formulae to link particles, atomic numbers and relative atomic mass.

Syllabus
First assessment 2019
Course
Chemistry 4CH1

Exam points

  • label protons, neutrons and electrons on atomic diagrams and use relative charge data
  • define isotopes by same proton number and different neutron number in named atoms
  • calculate relative atomic mass from isotope masses and percentage abundances

Covered syllabus points

1.14 Atoms and molecules1.15 Atomic structure1.16 Atomic number and isotopes1.17 Relative atomic mass

Question 1

[Maximum number: 1]

This question is about elements, compounds and mixtures.

The box gives the names of some substances.

Table for Question 1 — Edexcel IGCSE Chemistry

Choose a substance from the box to answer each of these questions.

Give the name of a diatomic molecule.

Question 2

[Maximum number: 9]

Question (a)

(a)

Table 1 gives some information about three subatomic particles.

[ 4 ]

Question (i)

(i)

Complete Table 1 by giving the missing information.

Table 1

Table 1

[ 3 ]

Question (ii)

(ii)

Give the name of the part of the atom containing protons and neutrons.

[ 1 ]

Question (b)

(b)

Table 2 shows the numbers of protons, neutrons and electrons in the species U, V, W, X, Y and Z.

Table 2

Table 2

[ 2 ]

Question (i)

(i)

Give the mass number of Z.

[ 1 ]

Question (ii)

(ii)

Give the letters of the two species that are isotopes of the same element.

[ 1 ]

Question (c)

(c)

A sample of neon contains two isotopes, 20Ne{ }^{20} \mathrm{Ne} and 22Ne{ }^{22} \mathrm{Ne}

The relative abundances of the two isotopes in the sample are

20Ne91.2%22Ne8.80%{ }^{20} \mathrm{Ne} 91.2 \% \quad{ }^{22} \mathrm{Ne} 8.80 \%

Calculate the relative atomic mass of this sample of neon.
Give your answer to one decimal place.

[ 3 ]

Question 3

[Maximum number: 5]

This question is about Group 2 elements and their compounds.

Question (a)

(a)

A sample of magnesium contains three isotopes.

Table for Question (a) — Edexcel IGCSE Chemistry
[ 5 ]

Question (i)

(i)

State, in terms of subatomic particles, what is meant by the term isotopes.

[ 2 ]

Question (ii)

(ii)

Calculate the relative atomic mass (Ar)\left(A_{r}\right) of magnesium.

Give your answer to one decimal place.

Ar=A_{r}=
[ 3 ]
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