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Absolute Dating Chapter 3, Sec.3
Process to find the approximate age of rocks or fossils
Atoms Smallest part of matter Made of protons, neutrons, electrons Center called the nucleus
Everything is made of atoms
Protons, neutrons in nucleus Electrons move around nucleus
Every element has a diff. # of protons
Isotopes Atoms of the same element with different # of neutrons
Radioactive Decay Most atoms are stable Some are unstable and breakdown or decay (radioactive)
High energy particles are given off Can damage cells, organs, etc.. X-rays, gamma rays, electrons, protons, neutrons
Decay occurs at a constant rate called half-life
Half-life The time it takes for one-half of a sample to decay
Problem I start with 10 grams of a sample It’s half-life is 20 years After 20 years, how much left? After 40 years, how much left 5 grams 2.5 grams
Some unstable isotopes decay into stable isotopes
3 radioactive dating methods Uranium-Lead Method Potassium-Argon Method Carbon-14 Method
Absolute Age Finding a rocks birthday. Absolute Age? Give an example of an absolute age of a rock layer… That rock layer is 200 million years old. Remember,
CHAPTER 24 Nuclear Energy I. Radioactivity (p ) I. Radioactivity (p )
IV. Isotopes 2 or more atoms of the same element having the same number of protons BUT different numbers of neutrons.
Radioactivity Chapter 6.1. Radioactivity Comes from an unstable nucleus Can be either… Particles or Energy (as electromagnetic radiation) or Both.
Radioactive Decay & C- 14 Dating Evolution Unit Chapter 14 p.382.
Nuclear Reactions Alpha, Beta, and Gamma Decay. State what is meant by alpha, beta and gamma decay of radionuclides. Identify the processes occurring.
Section 1Nuclear Changes Section 1: What is Radioactivity? Preview Key Ideas Bellringer Nuclear Radiation Nuclear Decay Math Skills Radioactive Decay Rates.
Nuclear Reactions Chapter 10. Standards SPS3. Students will distinguish the characteristics and components of radioactivity SPS3a. Differentiate among.
… it is highly important for us to gain some notion, however imperfect, of the lapse of years. Charles Darwin: On the Origin of Species 1859 Chapter 9:
Radioactivity & Nuclear Rxns Chapter 6.1 & 6.2. Nuclear Radiation Comes from an unstable nucleus Radiation can be released as either… –Particles –or.
Nuclear Reactions Alpha, Beta, and Gamma Decay. CS 4.2 CS 4.3 State what is meant by alpha, beta and gamma decay of radionuclides. Identify the processes.
CHAPTER 20 Nuclear Chemistry and Radioactivity 20.3 Rate of Radioactive Decay.
Radioactive Isotopes and Half Life 1. What is a Radioactive Isotope? What is Radioactive Decay? What is Half Life? (Take notes as we discuss) 2.
Chemistry: The Nature of Matter. Elements An element is a pure substance of one type of atom that cannot be broken down into other substances Periodic.
Nuclear Chemistry A Short Study. A Review Element – Chemical substance that cannot be divided by chemical means –All atoms of the same element have.
Radioactivity. Radioactivity – Particles are emitted from an unstable nuclei. positron High Energy Photons gamma β-β- Beta αAlpha symbolName β+β+
Unit 2 Notes – Radioactivity Mr Nelson. Facts about the nucleus Radius = cm ( cm) Radius = 1/ th of an atom Density = 1.6x10.
How do we determine geologic age? 1.Uniformitarianism = the processes that shape Earth have not changed.
CHAPTER 22 Nuclear Chemistry II. Radioactive Decay (p ) II. Radioactive Decay (p ) I IV III II.
The ABC's (or Alpha, Beta, Gamma) of Radioactivity.
Nuclear Chemistry. Chemical vs. Nuclear Reactions Chemical reactions involve valence electrons and atoms bonding together. Nuclear Reactions involve the.
What pieces of evidence do scientists use to back up the theory of Evolution? What pieces of evidence do scientists use to back up the theory of Evolution?
How Can We Change Lead Into Gold?. What Element is This?
Unit 2 Notes – Radioactivity Part II Mr Nelson. Transuranium elements & Radioactivity Transuranium elements are just elements #93-11? (anything after.
Evidence For Evolution. We have defined evolution as change over time. Through his studies of Lamarck and his voyages around the world, Charles Darwin.
Unit 2 Notes – Radioactivity Mr Nelson Facts about the nucleus Radius = cm ( cm) Radius = 1/ th of an atom Density = 1.6x10.
Chapter 18 Nuclear Reactions. Chemical Reactions Occur in the outer electron energy level Valance electrons.
Science Park HS -- Honors Chemistry The ABC's (or Alpha, Beta, Gamma) of Radioactivity.
1.Calculate the number of neutrons present in a carbon 14 nucleus. Radio-carbon dating is used to estimate the age of objects that were once living. All.
Chapter 22 notes. Types of nuclear reactions Fission- splitting of nucleus- nuclear waste Fission- splitting of nucleus- nuclear waste Fusion- nuclei.
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