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Chemistry Ch 21

nuclear radiation

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
Created by: pace_sauce