Oxford AQA IGCSE · Chemistry (9202)

A simple model of the atom: Practice Questions

5 multiple-choice questions marked as you go, and 5 written questions with worked solutions. All on A simple model of the atom.

10 questions24 marksFree, no account

Question 1

1 mark

An atom of sodium can be represented as \( {}_{11}^{23}\text{Na} \).

What are the relative electrical charges of a proton and an electron?

Question 2

1 mark

Which row in the table correctly identifies the relative mass and relative charge of a proton?

A. Mass: 1, Charge: +1
B. Mass: 1, Charge: 0
C. Mass: Very small, Charge: +1
D. Mass: 1, Charge: –1

Question 3

1 mark

A metal atom reacts to form an ion with a charge of \( 2+ \). If the ion has 18 electrons and a mass number of 40, what is the identity of the element and how many neutrons does it have?

Question 4

1 mark

The mass number of an atom is defined as the total number of specific subatomic particles in the nucleus. Which statement correctly describes the mass number?

Question 5

1 mark

The 'plum pudding' model suggested that the atom was a ball of positive charge with negative electrons embedded in it. Which experimental result directly contradicted this by showing that the positive charge was concentrated in a small center?

Question 6

2 marks

An atom of an element is represented by the symbol \( {}_{15}^{31}\text{P} \).

Determine the number of protons and the number of neutrons located in the nucleus of this atom.

Write your answer out first, then check it against the worked solution.

Question 7

3 marks

An atom of an unknown element has the electronic structure 2, 8, 7. Identify the element and state which group of the periodic table it belongs to.

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Question 8

6 marks

Boron has two isotopes, \( ^{10}_{5}B \) and \( ^{11}_{5}B \). Compare the subatomic particles in these isotopes and explain why they react in the same way chemically.

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Question 9

4 marks

(a) Define the term mass number of an atom. (1 point)
(b) An atom of an element is represented as \( ^{24}_{12}\text{Mg} \). Determine the number of protons, neutrons, and electrons present in this neutral atom. (3 points)

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Question 10

4 marks

The structure of the atom is the basis for understanding chemistry. An atom of Phosphorus is represented by the symbol \( ^{31}_{15}P \).
(a) Determine the number of protons, neutrons, and electrons in a neutral atom of this isotope.
(b) State the electronic structure of this Phosphorus atom in the form \( x,y,z \).
(c) Explain why the overall electrical charge of this Phosphorus atom is zero.

Write your answer out first, then check it against the worked solution.

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