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Unit 5 Review

Across
the giving off of rays of energy or particles by the breaking apart of atoms of certain elements; due to an unstable nucleus
an interstellar cloud of dust, hydrogen, helium and other ionized gases
a low to medium sized star will become this after it runs out of hydrogen to fuse; gets large (2 words)
number of protons; all atoms of a specific element have the same number of protons (all isotopes of a given element) (2 words)
the process by which a nucleus of an unstable atom loses energy by emitting particles or energy (2 words)
opposite charges attract (electrostatic attraction) and like charges repel (electrostatic repulsion) (2 words)
they have a short half - life so that they are quickly eliminated from the body; used to image some part of the body (3 words)
a process in which the nucleus of a heavy (large) atom is split apart into two lighter (smaller) nuclei; done in nuclear power plants and produces radioactive waste
relative brightness of a star
the process of two small atomic nuclei coming together to make a larger nucleus which is stable; release a huge amount of energy
describes the time it takes for half of the atoms in a radioactive sample to change from the parent isotope to the daughter isotope, and half to remain the same
Down
A force which can hold a nucleus together against the enormous forces of repulsion of the protons (3 words)
a cloud of gas and dust that has condensed due to gravity and started nuclear fusion that sends out its own light
(mass x percent abundance of isotope 1) + (mass x percent abundance of isotope 2)... (3 words)
what forms after a low to medium sized star runs out of hydrogen for fusion after the outer shell is released into space; is extremely dense causing it to be hot and dim (low luminosity) (2 words)
a radioactive isotope
contains protons and neutrons
the number of protons + number of neutrons (2 words)
any of two or more species of atoms of a chemical element with the same atomic number and nearly identical chemical behavior but with differing atomic mass or mass number and different physical properties
a phase where stars live out the majority of their lives; the "adult" portion of a star's life
a graph of stars showing the relationship between the stars' luminosities and their temperatures