NuclearDecaySE

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ExplorJ eamingName:Lore Urigrxfo Ecpa _________________________Dale:6th o* May. 2024Student Exploration: Nuclear DecayVocabulary:alpha particle, atomic number, beta particle, daughter prouuct. gamma ray,isotope, mass number, nuclear decay, positron, radioactive, subatomic particlePrior Knowledge Questions {Do these BEFORE using the Gizmo.)The chartbelowgives the locations, charges, and approximate masses of threesubatomicparticles. The approximate mass of each particle is given in universal mass units (u).ParticleLocationChargeApproximate massProtonNucleus1*l uNeutronNucleus01 uElectronOrbitals1-0 u1.The mass number of an atom is equal to the sum of protors ard neutrons in the nucleus.A helium atom has 2 protons ana 2 neutrons. What is the mass number of this a t o m ? 42.The atomicnumberof an element is equal to the number of protons in each atom of theelement. All helium atoms have 2 protons. What is the atomic number of helium?2Gizmo Warm-upWhile most atoms are stable, some areradioactivewhichmears that they have a tendency to undergo spontaneousnuclear decay.The decay of raoioactive atoms generallyresults in theemissionof particles and/or energy.Several types of nuclear decay car be explored with theWuc/ear Decay Gizmo™. On the Gizmo, check thatAlphadecay and Uranium are selected.K s j r**1JBKirotiJJ 4MWHH1.Click Play(- »and then click Pause/>) when thealphaparticle is clearly visible.What is an alpha particle made of?? -irrnnsrrrr-s___________________2.Click Play ard observe. Besides the alpha particle, what else is emitted from the nucleusduring alpha decay?Ganrm lays.________________________________Gammaraysare energetic electromagnetic waves; they are often emittedinnuclear decay.

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Get the Gizmo ready :*Click Reset»Check chatAlpha decayandUraniumareselected.Activity A:Alpha decayQuestion: How does alpha decay change the nucleus of a radioactive atom?1.Prenict: As you observer in the warm-up activity, an alpha particle consists of two protonsand two neutronsHow will the emission of ar alpha panicle affect the following?A. The atomic number of the atom:goes down by 2-B. The mass number of the atom:rxes down py /2.Calculate: Turr onWrite equation.What you seeisan eouation that shows the originaluranium atom on the left. The boxes on the right represent thedaughter product—the atomproduced by rauioactive decay— and the emitten alpha particle.A. In the top left box. write the mass number of the daughter product ano press 'Enter1onyour keyboard. What is this number?B.Inthe bottom left box, write the atomic numberofthe Daughter proauct ard pressdEnter.” What is this number?C. In the next set of boxes, enter the mass number and atomic number of the alphaparticle, which has the same composition as the nucleus of a helium (He) atom. Afterfilling in the boxes in the Gizmo, write the completed equation below:Newnumber42HeNew atomic numberD. According to your equation, whatisotoperemains after the alpha decay ofurarium-238? (Note: You car look up element symbols on the periodic table.)_____________________________________________________3.Check: Turn orShowequation, ard click Play. The equation will appear at the end of theanimation. Was your prediction correct?If not. modify your equation above.(Activity A continued on next page)

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