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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 Absolute Dating Radiometric Dating Half Life Isotope Radioactive decay Carbon 14.
A Fossil. Any method of measuring the age of an event or object in years.
What are the limitations of relative age dating? What do you think Absolute age dating is?
Sci. 3-3 Absolute Dating: A measure of Time Pages
Section 8-3 Radioactive Dating. Intro To Matter Elements – the simplest form of matter (i.e. Hydrogen (H) or Oxygen (O) – Atoms – the smallest particle.
8.3 Radioactive Dating.
Absolute Dating Chapter 7 Lesson 2.
Absolute Dating. Absolute dating provides a numerical age for the material tested, while relative dating can only provide a sequence of age. Absolute.
Radioactive Dating Chapter 7 Section 3. What Is Radioactive Decay? Most elements do not change. But some elements can break down (decay) over time. When.
ABSOLUTE AGE Absolute dating- used to determine the age of a rock or fossil more exactly based on the properties of atoms An atom:
The fossil below is that of a Coelophysis and was found in upstate N.Y. Approximately how old is the rock?
25.2 – Nuclear Decay. Objectives Compare and contrast alpha, beta and gamma radiation. Define the half-life of a radioactive material. Describe the process.
Radioactivity Chapter 6.1. Radioactivity Comes from an unstable nucleus Can be either… Particles or Energy (as electromagnetic radiation) or Both.
ABSOLUTE DATING. What is Absolute Dating? Determining the actual age, in numbers of years, of something (rock, object, event). How do you do it? Index.
Tips on Dating. Why Date? Different methods of dating will help determine the actual age of a layer of rock or a fossil Scientists look at how much radioactive.
History of Life: Origins of Life Chapter Age of Earth The earth is about 4.5 billion years old How did we measure that? Radiometric Dating = calculating.
Dating Rocks and Remains Radioactive Decay: Vocabulary Half-Life: The amount of time it takes for half of a radioactive isotope to decay. Radioactive.
Absolute Dating It’s a decaying relationship.. Radioactivity Henri Becquerel discovered radioactivity in Until then there was no way of finding.
Chapter 3 Atomic Structure. The Structure Of the Atom Particle masschargelocation Proton1 AMU +1in nucleus Neutron 1 AMU 0in nucleus Electron 0 AMU -1.
Half Lifes. Atoms Proton Electron Cloud Neutron Atomic Number Number of protons – change this → change the element Hydrogen has one proton and one electron.
INTRODUCTION TO ABSOLUTE (RADIOMETRIC) DATING
Radioactive Dating Chapter 10. Absolute Dating Process of establishing the age of an object by determining the number of years it has existed Absolute.
Earth’s History is Recorded in Rocks Two Methods to Date Rocks.
Geologic History: Absolute Dating Unit 6 Absolute Age.
Atoms and Study of the Past I. What is an atom? An atom (element) is the basic unit of matter. The Periodic Table displays the 115 known atoms.
ABSOLUTE AGE: Measurements of natural radioactivity in rocks have allowed scientists to understand the numerical age of an object in years.
Chapter 7 Lesson 2 Isotopes and Radioactivity. What’s the difference between the two atoms in Figure 12? Left.
NUCLEAR CHEMISTRY Chapter 20. Nuclear Chemistry Radioactivity is the emission of subatomic particles or high- energy electromagnetic radiation by the.
Absolute Dating : A Measure of Time
Using radioactivity in dating Reviewing basic atomic structure Nucleus –Protons – positively charged particles with mass –Neutrons – neutral particles.
IV. Isotopes 2 or more atoms of the same element having the same number of protons BUT different numbers of neutrons.
Chapter 8 Section 2 Handout Determining Absolute Age.
Chapter 7: Earth Materials as Time Keepers
Table of Contents Titles: Age and Time Page #: 13 Date: 9/12/12.
Absolute Dating of Rocks and Strata
Radioactive Dating Section 10.3.
Radioactive Decay. What do you know about Radioactivity? 1.All atoms are made up of __________. 2.What are some radioactive isotopes? 3.Why do some isotopes/atoms.
UNIT 3 Geologic Time and Fossils
Alpha, Beta, and Gamma Decay
-Different FORMS of an Element that occur Naturally -Have the SAME # of P and E but DIFFERENT # of N -Isotopes of an element have the SAME CHEMICAL PROPERTIES.
What is it to be Radioactive? Radioactive decay is the process in which an unstable atomic nucleus loses energy by emitting radiation in the form of particles.
Relative and absolute age dating of rocks. What is absolute age dating? The Principle of Superposition and rock correlation provide the relative ages.
Nuclear Chemistry The Atom The atom consists of two parts: 1. The nucleus which contains: 2. Orbiting electrons. protons neutrons Multiple nuclei is.
1.Will not take any after next Tuesday 1/13 1.Define each of these terms: You may use your notes and they do not need to be in complete sentences Energy.
Do Now: Think about this… If you were standing 10 feet from the wall, and I asked you to walk half the distance to the wall, how close would you be? If.
Nuclear Decay You will be learning: 1.What is alpha, beta, and gamma radiation. 2.Know the half-life of a radioactive material. 3.How to describe the process.
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