Radioactivity and Nuclear Reactions

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Slide 1

Contents

Section 1 Radioactivity slides 3-31

Section 2 Nuclear Decay slides 32-55

Section 3 Detecting Radioactivity slides 56-74

Section 4 Nuclear Reactions slides 75-106

Slide 2

Radioactivity

What You’ll Learn

What particles make up an atom and its nucleus

How the nucleus is held together

What radioactivity is

The properties of radioactive and stable nuclei

Slide 3

The Nucleus

The atom is made up of protons, neutrons and electrons.

Slide 4

The Nucleus

The atom is made up of protons, neutrons and electrons.

Positively-charged protons and electrically neutral neutrons are located in the nucleus.

Slide 5

The Nucleus

The atom is made up of protons, neutrons and electrons.

Positively-charged protons and electrically neutral neutrons are located in the nucleus.

Each proton has one positive charge or +1 so each nucleus has a positive charge equal to the number of protons that it has.

Slide 6

The Nucleus

The number of protons is called the element’s atomic number.

Slide 7

The Nucleus

The number of protons is called the element’s atomic number.

Atoms contain the same number of protons as negatively-charged electrons.

Slide 8

The Nucleus

The number of protons is called the element’s atomic number.

Atoms contain the same number of protons as negatively-charged electrons.

The electric attraction of opposites pulls the electrons close to the nucleus.

Slide 9

Is the nucleus the largest part of an atom?

Protons and neutrons are packed together tightly so that the nucleus takes up only a tiny part of an atom.

Slide 10

Is the nucleus the largest part of an atom?

Protons and neutrons are packed together tightly so that the nucleus takes up only a tiny part of an atom.

If an atom were the size of a football stadium, its nucleus would be the size of a marble!

Slide 11

Is the nucleus the largest part of an atom?