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Physics P2b Topic 5


P2b Topic 4 Isotopes

Topic 5 Ionising
Topic 6 Fission &

What is an isotope?

Recall the meanings of the terms Atomic Number, Mass
number and Relative Atomic Mass.

Understand the term `Isotope and calculate the relative

Page 2

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Physics P2b Topic 5

Write definitions for the following

Mass Number
This is the mass of an atom compared to all the other atoms
in the periodic table.

Atomic Number
This is the number of Protons found in the nucleus of an atom.

Relative Atomic Mass
This is the relative…

Page 3

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Physics P2b Topic 5

Look at your periodic table. The atomic masses are
all whole numbers except for....

The relative Atomic Mass of
Chlorine is recorded as 35.5.

35.5 ­ 17 = 18.5

You cant have half a neutron.
So how can this be explained?

All chlorine atoms have 17…

Page 4

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Physics P2b Topic 5

75% of the Chlorine in
existence is Cl35

25% of the Chlorine in
existence is Cl37

This means that the atomic mass shown in the periodic table
is an average of the masses of both isotopes taking into
account their relative proportions

(75 x 35) +…

Page 5

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Physics P2b Topic 5

The periodic table states that the
Relative Atomic Mass of Copper is 64


Copper has two naturally occurring isotopes.
69% of all Copper is Cu63 (34 neutrons)
31% of all Copper is Cu65 (36 Neutrons)

Calculate the average relative atomic mass of Copper

(69 x…

Page 6

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Physics P2b Topic 5


P2b Topic 4 Isotopes

Topic 5 Ionising
Topic 6 Fission &

Ionising radiation

Objective: Explain how radioactive
materials can ionise atoms

What is ionisation?

Use the text books to help you

Page 7

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Physics P2b Topic 5

An atom is ionised if one or more ___________ are
removed from the _______ ______.

If an electron gets enough _______, it can leave the

______, ______ and _______ radiation can provide
enough _______ to ionise atoms.

Page 8

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Physics P2b Topic 5

Page 9

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Physics P2b Topic 5

Complete questions 1-7 in full sentences in your book.

Use the text to help you find the answers.

Draw a table to summarise the information that you have
found out about each of the 3 types of ionising radiation

Page 10

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Physics P2b Topic 5

Explain how an oxygen molecule in the air might become an
ion by being near a radioactive source.

6 marks = 6 minutes

Answer this with a paragraph and any relevant diagrams.

What is Nuclear Power?

Objective: Understand the principle of nuclear

The process of…


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