If the half-life of Au-205 is 4.8 minutes, what fraction of the sample will be left after 14.4 minutes?
a.) 1/2
b.) 1/4
c.) 1/8
d.) 1/16

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Astable electron arrangement for an atom is one that does not easily change. how is this arrangement arrived at? a. valence electrons are transferred or shared to create a full outer shell of electrons. b. valence electrons are discarded into space to create a full outer shell of electrons. c. protons (positive charge) pair with valence electrons (negative charge) to create a strong bond. d. outer shells with valence electrons are transferred or shared.