Chapter Preview 4.1 Introduction to Atoms 4.2 Organizing the Elements 4.3 Metals 4.4 Nonmetals, Inert Gases, and Semimetals 4.5 Radioactive Elements Table.

Chapter Preview

4.1 Introduction to Atoms

4.2 Organizing the Elements

4.3 Metals

4.4 Nonmetals, Inert Gases, and Semimetals

4.5 Radioactive Elements

Table of ContentsChapter Preview

4.1 Introduction to Atoms

4.2 Organizing the Elements

4.3 Metals

4.4 Nonmetals, Inert Gases, and Semimetals

4.5 Radioactive Elements

Section 5:Section 5:Radioactive ElementsRadioactive Elements

How was radioactivity discovered?How was radioactivity discovered?

Section 5:Section 5:Radioactive ElementsRadioactive Elements

How was radioactivity discovered?How was radioactivity discovered?

In 1896, the French scientist Henri In 1896, the French scientist Henri Becquerel discovered the effects of Becquerel discovered the effects of radioactive decay by accident while radioactive decay by accident while studying a mineral containing studying a mineral containing uranium.uranium.

Section 5:Section 5:Radioactive ElementsRadioactive Elements

What types of particles and energy can What types of particles and energy can radioactive decay produce? radioactive decay produce?

Section 5:Section 5:Radioactive ElementsRadioactive Elements

What types of particles and energy can radioactive What types of particles and energy can radioactive decay produce? decay produce?

Radioactive decay can produce alpha particles, beta Radioactive decay can produce alpha particles, beta particles, and gamma rays.particles, and gamma rays.

Types of Types of Radioactive DecayRadioactive Decay

During alpha decay, a nucleus loses an During alpha decay, a nucleus loses an alpha particle, which consists of two alpha particle, which consists of two protons and two neutrons.protons and two neutrons.

Types of Types of Radioactive DecayRadioactive Decay

During beta decay, a neutron inside an During beta decay, a neutron inside an unstable nucleus changes into a unstable nucleus changes into a negatively charged beta particle and a negatively charged beta particle and a proton.proton.

Types of Types of Radioactive DecayRadioactive Decay

Gamma radiation has no charge and Gamma radiation has no charge and does not cause a change in either the does not cause a change in either the atomic mass or the atomic number.atomic mass or the atomic number.

Types of Types of Radioactive DecayRadioactive Decay

The three types of nuclear radiation The three types of nuclear radiation were named based on how easily each were named based on how easily each one could be blocked. Alpha, beta, and one could be blocked. Alpha, beta, and gamma are the first three letters of the gamma are the first three letters of the Greek alphabet.Greek alphabet.

Section 5:Section 5:Radioactive ElementsRadioactive Elements

In what ways are radioactive isotopes In what ways are radioactive isotopes useful?useful?

Section 5:Section 5:Radioactive ElementsRadioactive Elements

In what ways are radioactive isotopes useful?In what ways are radioactive isotopes useful?

Uses of radioactive isotopes include tracing the Uses of radioactive isotopes include tracing the steps of chemical reactions and industrial steps of chemical reactions and industrial processes, and diagnosing and treating diseaseprocesses, and diagnosing and treating disease

Using Radioactive Using Radioactive IsotopesIsotopesTracers are radioactive isotopes that Tracers are radioactive isotopes that

can be followed through the steps of a can be followed through the steps of a chemical reaction or industrial process.chemical reaction or industrial process.

Radioactive Radioactive Tracers ActivityTracers Activity

Click the Active Art button to open a Click the Active Art button to open a browser window and access Active Art browser window and access Active Art

about radioactive tracers.about radioactive tracers.

RadiationRadiation

Click the Video button to watch a movie Click the Video button to watch a movie about radiation.about radiation.

End of Section:End of Section: Radioactive Radioactive

ElementsElements

CitationsCitationshttp://www.scientific-web.com/en/http://www.scientific-web.com/en/Physics/Biographies/images/Physics/Biographies/images/HenriBecquerel.jpgHenriBecquerel.jpg

http://www.freedomforfission.org.uk/http://www.freedomforfission.org.uk/img/emission.jpgimg/emission.jpg