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Chemistry Ch 21
nuclear radiation
Definition | Term |
---|---|
A nuclear ________ controls fission chain reactions to produce useable energy | reactor |
One danger of nuclear reactors is the breakdown of cooling systems to allow ______-down | melt |
________ nuclei, with mass numbers over 82, are always unstable | large |
reaction occurring when neutrons produced in fission reaction strike other nuclei | chain reaction |
electron emitted when neutron changes into proton in nucleus | beta |
splitting of a heavyt nucleus | fission |
When electrical _______ between protons is greater than string forces, the nucleus will be unstable | repulsion |
Where does fusion occur? | sun |
protons and neutrons are _______ | nucleons |
atoms of the same element with different masses | isotopes |
emission with no mass or charge | gama |
nuclear bullets used in fission reactions | neutrons |
The nucleus makes up almost all the ________ of the atom | mass |
unstable nuclei are | radioactive |
Fusion reactions only occur at extremely high _______ | temperatures |
minimym mass required for chain fission reaction is ______ mass | critical |
the fuel for fusion reactions | hydrogen |
changing into another element through radioactive decay | transmutation |
man-made elements are by _______ of an isotope with nuclear "bullets" | bombardment |
the time it takes half the mass of a radioactive isotope to decay | half life |
combination of two nuclei into one | fusion |
large nuclei need a neutron to ______ ratio of over 1:1 to be stable | proton |
force of attraction between nearest neighbor nucleons | strong |
emitted particle identical to helium nucleus | alpha |
can penetrate paper, but not thick aluminum | beta |
can penetrate thick aluminum, but not concrete | gamma |
cannot penetrate paper | alpha |
4 2He | alpha |
0 -1e | beta |
Z number of an element is number of these | proton |
reactant and a product of nuclear fission | neutron |
repel each other in the nucleus | proton |
has no mass and no charge | gamma |
2 isotopes of same element have number of these in common | proton |
2 isotopes of same element have different number of these | neutron |
Uranium spontaneously decays | natural transmutation |
bombardment of a stable isotope to forxe it to decay | artificial transmutation |
heavy nuclei are bombarded with neutrons and split | nuclear fission |
combination of two nuclei into one with release of energy | nuclear fusion |
changing into another element through radioactive decay | transmutation |
particles occupying the nucleus | nucleons |
atoms of same element with different numbers of neutrons (different masses) | isotopes |
spontaneously emits a particle and decays into another element | radioactive isotope |