30 Understanding the AtomCopyright © McGraw-Hill Education.Protons, Neutrons, and Electrons—How Atoms DifferLesson 2Skim Lesson 2 in your book. Read the headings and look at the photos and illustrations.Identify three things you want to learn more about as you read the lesson. Record your ideasin your Science Journal.Distinguish parts of the atom.Part Electron Proton NeutronSymbolChargeLocationRelativeMassRelate details about atomic number.Atomic Numberdetermines equals ,and also equalsin neutral atomsDifferentiate numbers of protons and neutrons in different isotopesof the same element.Numbers ofprotons:Numbers ofneutrons:Isotopes ofthe SameElementContrast the numbers of particles represented by an element’s massnumber and atomic number.Atomic Number Mass NumberThe Parts of the AtomI found this on page.Neutrons and IsotopesI found this on page.Different Elements—Different Numbers ofProtonsI found this on page.I found this on page.1Rt IElectron cloud nucleus. Nucleus1/1,840. 1The type ofelementsThe number of protonsThe number of electronsAlways have thesame numberAre goingto changeSome protons Some neutrons Understanding the Atom 31Lesson 2 | Protons, Neutrons, and Electrons—How Atoms Differ (continued)Copyright © McGraw-Hill Education.Define average atomic mass.Differentiate three types of nuclear decay that occur inradioactive elements.Type Change ResultAlphadecayBeta decayGammadecayContrast the formation of ions.Positive Ion Negative IonA neutral atom.Result:.A neutral atom.Result:.Summarize why people were unsuccessful over 1,000 years ago when theytried to transform lead into gold. What process would they have needed to complete in order tohave been successful?I found this on page.RadioactivityI found this on page.Ions—Gaining or LosingElectronsI found this on page.The average mass of an elements isotopes,weighted according to the abundance of eachisotopeTwo protons andneutronsNew elementsatomic numberdecreased by twoNeutrons becomesa protonNew elementsatomic numberincrease by oneRelease of thegamma rays Same elementsno change in theprotonsLoses one or moreElectronsThe atom has apositive chargeGains one or moreElectronsThe negativebecomes a positiveThey did not have the technology to make this change