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Section 4.4 Unstable Nuclei and Radioactive Decay
Objectives Explain relationship between unstable nuclei and radioactive decay Characterize alpha, beta, and gamma radiation in terms of mass and change
Review Recall chemical reactions –Are new substances formed? –Were atoms affected/changed? Chemical reactions only involve electrons Nucleus is NOT affected in CHEMICAL REACTIONS
Nuclear Reactions DO change the nucleus Atoms of one element change into atoms of another
Radioactivity Substance spontaneously emits radiation Rays and particles are called radiation Atoms change into other elements
Unstable Systems Radioactivity occurs when an atom’s nucleus is unstable Unstable systems gain stability by losing energy
Radioactive Decay Unstable nucleus loses energy by emitting radiation spontaneously Radiates until stable New atom forms
Types of Radiation Alpha Beta Gamma
Alpha Radiation Deflects toward a negative charge Alpha particles 2 protons & 2 neutrons 4 2 He or Blocked by only a thin sheet of paper
Nuclear Equation Ra Rn He Radium Radon
Beta Radiation Deflect toward positive charge Beta particles, Electron (-1 charge) Aluminum blocks beta radiation 14 6 C 14 7 N
Gamma Radiation High energy radiation No mass No charge Most dangerous Accompany or particles Account for energy lost CANNOT form new atom on its own 0 0
Characteristics of Radiation Types RadiationSymbolMass (amu) Charge Alpha 42+ Beta 1/ Gamma 00
Practice Co Ni + ____ Am ____ He
Practice Solution Complete the following nuclear reactions: Co Ni Am Np He
Section 4.4 Unstable Nuclei and Radioactive Decay.
Unstable Nuclei and Radioactive Decay. Radioactivity (Radioactive decay) The process by which some substances spontaneously emit radiation. Radioactive.
Chemistry Chapter 4 Notes #3 (Sec 4). Unstable Nuclei Nuclear Reactions Nuclear Reactions –Rxns that involve a change in the nucleus of an atom (most.
Unstable atoms emit radiation to gain stability. Section 4: Unstable Nuclei and Radioactive Decay K What I Know W What I Want to Find Out L What I Learned.
Unstable Nuclei and Radioactive Decay Objectives: 9.0 Distinguish between chemical and nuclear reactions. 9.3 Identifying types of radiation and their.
Radioactivity Some substances spontaneously emit radiation – radioactivity The rays and particles emitted are called “radiation”. Radioactive elements.
George M. McKelvy, Ph.D.1 Chapter 4 The Structure of the Atom.
Section 4.4 Unstable Nuclei and Radioactive Decay Explain the relationship between unstable nuclei and radioactive decay. element: a pure substance that.
Unstable Nuclei and Radioactive Decay Section 4.4.
Radioactive Decay Radioactivity results from having an unstable nucleus. When these nuclei lose energy and break apart, decay occurs. Radioactive decay.
Unstable Nuclei & Radioactive Decay Standard: 11d, 11e Article: 105 Mastering Concepts: 112(53-58) Terms: 105 Homework: Cornell Notes: 4.4 Section Assessment:
7.1 continued: Radioactive Decay. A brief review of last class… https://www.youtube.com/watch?v=IVtwfSBSLtI.
4.4 Unstable Nuclei and Radioactive Decay Radioactive decay In the late 1890s, scientists noticed some substances spontaneously emitted radiation, a.
Average Atomic Mass Unstable nuclei and Radioactive Decay.
Section 4-4 Section 4.4 Unstable Nuclei and Radioactive Decay Explain the relationship between unstable nuclei and radioactive decay. element: a pure.
HomeworkHomework Read section 4.4 Answer questions 26 & 27 on page 107.
HOW ATOMS DIFFER If all atoms are made up of protons, electrons, and neutrons, what makes them different? They differ in the number of these particles.
Chemical Reactions Involves the change of one or more substances into new substances Atoms are rearranged but their identities do NOT change The reaction.
Date: 3-18 Topic: Ch4.4 Glen Chem.. Overview Objective Warm-up Standard ESLR Notes Classwork Homework Dispatch Summary.
Nuclear Radiation Half-Life. What is Radiation? Penetrating rays and particles emitted by a radioactive source Result of a nuclear reaction! –Involves.
Nuclear Energy. Nuclear energy is all around us and can be used for medical purposes. Nuclear energy is when an atom is split and releases energy or particles.
Radioactive Decay Radioactive Decay. Radioactive Decay: Some unstable atoms try to regain stability by losing energy. They lose energy by emitting radiation.
Periodic Table and Structure of Atom Chemistry Honors MAC Dr. Saha.
RADIOACTIVITY VS. CHEMICAL REACTIONS CHEMICAL REACTIONS make new substances by rearranging atoms and forming bonds. The atoms do not change in the process.
NUCLEAR CHANGES What is Radioactivity?. What happens when an element undergoes radioactive decay? During radioactive decay an unstable nuclei of an isotope.
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.
Nuclear Chemistry. The Atom The atom consists of two parts: 1. The nucleus which contains: 2. Orbiting electrons. protons neutrons.
Chapter 25 Nuclear Chemistry Ch Nuclear Radiation.
Nuclear Chemistry Types of Radioactive Decay Kinetics of Decay Nuclear Transmutations.
Drill – 10/21 Clear desk of everything and take outline, ½ sheet of paper, and pen or pencil out.
Nuclear Chemistry. Nuclear Reactions Nuclear chemistry is the study of changes in an atom’s nucleus. Nuclear chemistry is the study of changes in an atom’s.
Nuclear Chemistry “Bravo” Test 1954 – 15,000 kilotons.
Section 1: Nuclear Radiation Under certain conditions, some nuclei can emit alpha, beta, or gamma radiation. K What I Know W What I Want to Find Out L.
Nuclear Decay (Radioactivity) Subatomic particles Electron -negatively charged particle found outside the nucleus. Proton – positively charged subatomic.
Radiation can be separated into different types by passing neared charged plates. Negatively charged particles are deflected towards the positive plate,
Nuclear Chemistry. Why Study Nuclear Chemistry Medical Applications Medical Applications X-Rays X-Rays Radiation Treatments Radiation Treatments Scans.
Unit 2: The Atom Nuclear Decay. Band Of Stability Atoms that lie outside the band of stability are unstable Atoms 1-20 n 0 /p + ratio must be 1:1.
Day 8 Chapter 4 Section 4. Mass Number Isotopes have different mass numbers The mass # is the sum of the protons and neutrons. (# protons) + (# neutrons)
7.1 Atomic Theory and Radioactive Decay Natural background radiation exists all around us. Natural background radiation exists all around us. Radioactivity.
7.1 Nuclear Reactions What are atoms made of? Which particles are found in the nucleus? What are the three types of ionising radiation? What are the three.
Atomic # # of protons in an atom Never changes for a given element Therefore, used to always identify the element.
QUIZ NUCLEAR CHEMISTRY. NUCLEAR CHEMISTRY QUIZ 1.Compare what happens to atoms in both a chemical reaction and a nuclear reaction. 2.What happens to the.
Chapter 15 Nuclear Radiation. Radioactive Isotopes A radioactive isotope has an unstable nucleus and emits radiation to become more stable. Isotopes of.
Nuclear Chemistry. Parts of the atom ParticleCharge Mass (g) Mass (amu) Proton x Neutron x Electron 9.110x /1839.
Unstable Nuclei and Radioactive Decay Radioactivity – spontaneous emission of radiation Radiation – rays and particles emitted from a radioactive material.
Atomic Theory, Isotopes, and Radioactive Decay PowerPoint 7.1.
Nuclear Decay Notes Stability Curve Atomic number Z Neutron number N Stable nuclei Z = N Nuclear particles are held.
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 3 Atomic Structure. The Structure Of the Atom Particle masschargelocation Proton1 AMU +1in nucleus Neutron 1 AMU 0in nucleus Electron 0 AMU -1.
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