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SCHS Chapter 4

Glencoe Chemistry Chp 4

TermDefinition
alpha particle radiation contains two protons and two neutrons
alpha radiation radiation that was deflected toward the negatively charged plate. + charge
atom The smaller particle of an element that retains the properties of the element
atomic mass is the weighted AVERAGE mass of the isotopes of that element
atomic mass unit AMU AS 1/12 the mass of Carbon =~1 nearly.... 1 amu~ equal to mass of 1 proton or neutron
atomic number the number of protons in an atom atomic number=number of protons=number of electrons
beta particle radiation consist of fast moving electrons
beta radiation radiation that was deflected toward the positively changed plate. - charge
cathode ray rays (radiation) coming from the cathode end of the tube.
Dalton's atomic theory developer of modern atomic theory (revived/revised Democritus ideas) Pg. 89
electron negatively charges particles that are part of all forms of matter
gamma ray are high-energy radiation that possess no mass, no electrical charge, are not deflected by electric or magnetic fields. Usually accompany alpha and beta radiation and account for most of the energy lost during radioactive decay process.
isotope atoms with the same number of protons but different numbers of neutrons
mass number to identify the various isotopes of an element chemists add a number after the elements name. It represents the sum of the number of protons and neutrons in the nucleus.
neutron has a mass nearly equal to that of a proton, but carries no electrical charge
nuclear equation it shows the atomic number and mass number of the particles involved. both are conserved in nuclear equation
nuclear reaction when atom of element changing into an atom of another element involving change in the nucleus.
nucleus Tiny dense region centrally located with the atom that contained all of atom's positive charge (protons)particles and virtually all of its mass
proton a subatomic particle carrying a positive charge equal to but opposite of an electron's negative charge
radiation rays and particles edited by radioactive material
radioactive decay unstable nuclei lose energy emitting radiation in a spontaneous process (requiring no energy)
radioactivity substances emit radiation
Created by: gayledains