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Chapter 4 Vocabulary

Vocabulary from chapter 4 of textbook

Cathode Ray Ray of radiation that originates from the cathode end of the tube.
Electron negatively charged subatomic particle.
Nucleus small dense and centrally located within the atom. Contains all the atom's positive charge and virtually all of its mass.
Proton positively charged subatomic particle.
Neutron neutrally charged subatomic particle.
Table O illustrates the symbols, charges and masses of subatomic particles and nuclear emanations.
Atomic Number The number of protons in the nucleus of an atom. Identifies the atom.
Isotope Atoms with the same number of protons (atomic number) but different number of neutrons (mass number)
Mass Number The sum of the protons and the neutrons in the nucleus of an atom.
AMU Atomic Mass Unit - 1/12 the mass of a carbon-12 atom.
Atomic Mass The weighted average mass of all naturally occurring isotopes of an element.
Nucleons The subatomic particles found in the nucleus (protons and neutrons).
Nuclear Reactions A reaction that involves a change in an atom's nucleus.
Radioactivity A process occurring when a substance spontaneously emits radiation.
Radiation The rays and/or particles emitted by a radioactive material.
Radioactive Decay Occurs when unstable nuclei lose energy by emitting radiation in a spontaneous process.
Alpha Radiation Radiation deflected towards a negative plate.
Alpha Particle A particle with 2 protons and 2 neutrons.
Nuclear Equation illustrates the mass number and atomic number for each particle involved.
Beta Radiation Radiation deflected towards a positive plate.
Beta Particle A particle with negligible mass and a negative charge.
Gamma Ray High energy radiation that possess no mass or charge.
Created by: Silvs216



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