Chapter Two Pt. 3
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What are the major players in radioactivity?
- three major types of radiation emitted by particles are:
- Beta rays (electrons)= negative
- Gamma Rays (pure energy= no mass)
- Alpha rays= positive particle (release Helium)
A __ is an electron.
Both __ and __ have partciles associated with __.
What is a nuclear equation?
a reaction that changes an atomic nucleus
What is beta radiation?
- a beta particle is an electron
- - neutron in nucleus spontaneously decays into a proton and electron; particles attracted to positive electrode and repelled by negative electrode
What is alpha radiation?
- An alpha particle is a helium-4 nucleus (2 protons and 2 neutrons)
- particlues repelled by positively charged electrode and attracted to negatively charged electrode
- - results in losee of 2 protons and 2 neutrons, reducing mass number of the nucleus by 4 and atomic # by 2
- a gamma particle is a high-energy photon
- - unaffected by electric/ magnetic fields
- - no mass
- - electromagnetic radiation of very high energy
What is positron emission?
- a positron has the same mass as an electron but the opposite charge
- - occurs when proton in nucleus changes into neutron plus ejected positron
- - decrease in atomic # of product nucleus but no change in mass #
What is electron capture?
process in which the nucleus captures an inner-shell electron, thereby converting a proton to a neutron
__ and __
What is fusion?
- - two smaller nuclei--> one big nuclei
What is fission?
- big atom--> 2 smaller
What is the problem with nuclear things?
- - takes hydrogen atoms and uses to pressure to produce He--> energy
- possible on earth
- ex: H bond
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