Isotopes and Radioactivity Isotopes Isotopes are atoms of
![Isotopes and Radioactivity Isotopes and Radioactivity](https://slidetodoc.com/presentation_image_h2/e65bf9efa029bd48d846c1ab618bbe96/image-1.jpg)
![Isotopes • Isotopes are atoms of an element having the same number of protons Isotopes • Isotopes are atoms of an element having the same number of protons](https://slidetodoc.com/presentation_image_h2/e65bf9efa029bd48d846c1ab618bbe96/image-2.jpg)
![Sample problems Sample problems](https://slidetodoc.com/presentation_image_h2/e65bf9efa029bd48d846c1ab618bbe96/image-3.jpg)
![What is radioactive decay? • This occurs when an unstable atomic nucleus changes into What is radioactive decay? • This occurs when an unstable atomic nucleus changes into](https://slidetodoc.com/presentation_image_h2/e65bf9efa029bd48d846c1ab618bbe96/image-4.jpg)
![Uses of radioactive decay • Other uses: – Detection of cancer and killing of Uses of radioactive decay • Other uses: – Detection of cancer and killing of](https://slidetodoc.com/presentation_image_h2/e65bf9efa029bd48d846c1ab618bbe96/image-5.jpg)
![Discovery • 1896, Antoine-Henri Bequerel -> uranium • Marie Curie separated radioactive elements in Discovery • 1896, Antoine-Henri Bequerel -> uranium • Marie Curie separated radioactive elements in](https://slidetodoc.com/presentation_image_h2/e65bf9efa029bd48d846c1ab618bbe96/image-6.jpg)
![Half-Life • Uranium is still found in nature because of how long it takes Half-Life • Uranium is still found in nature because of how long it takes](https://slidetodoc.com/presentation_image_h2/e65bf9efa029bd48d846c1ab618bbe96/image-7.jpg)
![How are elements discovered and named? • Some elements are not found in nature How are elements discovered and named? • Some elements are not found in nature](https://slidetodoc.com/presentation_image_h2/e65bf9efa029bd48d846c1ab618bbe96/image-8.jpg)
![Discovery • First they must be discovered and officially confirmed by International Union or Discovery • First they must be discovered and officially confirmed by International Union or](https://slidetodoc.com/presentation_image_h2/e65bf9efa029bd48d846c1ab618bbe96/image-9.jpg)
![Naming • Scientists who discover the elements get to name them • They can Naming • Scientists who discover the elements get to name them • They can](https://slidetodoc.com/presentation_image_h2/e65bf9efa029bd48d846c1ab618bbe96/image-10.jpg)
- Slides: 10
![Isotopes and Radioactivity Isotopes and Radioactivity](https://slidetodoc.com/presentation_image_h2/e65bf9efa029bd48d846c1ab618bbe96/image-1.jpg)
Isotopes and Radioactivity
![Isotopes Isotopes are atoms of an element having the same number of protons Isotopes • Isotopes are atoms of an element having the same number of protons](https://slidetodoc.com/presentation_image_h2/e65bf9efa029bd48d846c1ab618bbe96/image-2.jpg)
Isotopes • Isotopes are atoms of an element having the same number of protons but different numbers of neutrons. • How many neutrons? – Mass number – atomic number = number of neutrons
![Sample problems Sample problems](https://slidetodoc.com/presentation_image_h2/e65bf9efa029bd48d846c1ab618bbe96/image-3.jpg)
Sample problems
![What is radioactive decay This occurs when an unstable atomic nucleus changes into What is radioactive decay? • This occurs when an unstable atomic nucleus changes into](https://slidetodoc.com/presentation_image_h2/e65bf9efa029bd48d846c1ab618bbe96/image-4.jpg)
What is radioactive decay? • This occurs when an unstable atomic nucleus changes into another nucleus by emitting one or more particles and energy • A nucleus that is unstable is radioactive • Radioactive nuclei have found many uses in science and medicine – Iron-59 (an isotope) can be injected into a person’s bloodstream to show blood circulation – pg 303
![Uses of radioactive decay Other uses Detection of cancer and killing of Uses of radioactive decay • Other uses: – Detection of cancer and killing of](https://slidetodoc.com/presentation_image_h2/e65bf9efa029bd48d846c1ab618bbe96/image-5.jpg)
Uses of radioactive decay • Other uses: – Detection of cancer and killing of cancer cells • using coblat-60 to stop the growth of brain tumors – Preserving food • The radiation kills bacteria, fungi, insects, and other pests that spoil food
![Discovery 1896 AntoineHenri Bequerel uranium Marie Curie separated radioactive elements in Discovery • 1896, Antoine-Henri Bequerel -> uranium • Marie Curie separated radioactive elements in](https://slidetodoc.com/presentation_image_h2/e65bf9efa029bd48d846c1ab618bbe96/image-6.jpg)
Discovery • 1896, Antoine-Henri Bequerel -> uranium • Marie Curie separated radioactive elements in uranium mineral – With her husband Pierre, discovered polonium and radium • Most radioactive elements are heavier elements, near the bottom of the periodic table
![HalfLife Uranium is still found in nature because of how long it takes Half-Life • Uranium is still found in nature because of how long it takes](https://slidetodoc.com/presentation_image_h2/e65bf9efa029bd48d846c1ab618bbe96/image-7.jpg)
Half-Life • Uranium is still found in nature because of how long it takes to decay • Half-life is the time it takes for a sample of radioactive isotope to decay to half its original mass • EXAMPLES: – Uranium-235 takes 713 million years
![How are elements discovered and named Some elements are not found in nature How are elements discovered and named? • Some elements are not found in nature](https://slidetodoc.com/presentation_image_h2/e65bf9efa029bd48d846c1ab618bbe96/image-8.jpg)
How are elements discovered and named? • Some elements are not found in nature (or found in very small amounts) • Synthetic elements are radioactive elements made by scientists in labs or created during nuclear reactions • Technetium (43) was the first synthetic element • Visualizing Synthetic elements pg 308
![Discovery First they must be discovered and officially confirmed by International Union or Discovery • First they must be discovered and officially confirmed by International Union or](https://slidetodoc.com/presentation_image_h2/e65bf9efa029bd48d846c1ab618bbe96/image-9.jpg)
Discovery • First they must be discovered and officially confirmed by International Union or Pure and Applied Chemistry and the International Union of Pure and Applied Physics – Write a paper – Experts review the work to support the claims made – Set of rules: must be able to be repeated, following scientific principles, show distinct chemical/physical properties
![Naming Scientists who discover the elements get to name them They can Naming • Scientists who discover the elements get to name them • They can](https://slidetodoc.com/presentation_image_h2/e65bf9efa029bd48d846c1ab618bbe96/image-10.jpg)
Naming • Scientists who discover the elements get to name them • They can name after people they want to honor or places of birth
Antigentest åre
Atoms and radioactivity
Isotopes pogil
Periodic table of elements regents
Natural and artificial radioactivity
Natural and artificial radioactivity
Natural and artificial radioactivity
Key terms radioactivity and nuclear reactions
Becquerel discovery of radioactivity
Who discovered radioactivity
Are nuclear power plants fission or fusion