Acoin dropped from the top of a precipice takes 5.00 s to hit the ground. how high is the precipice

Which of the following statements is true? a. elements in the last period are radioactive. b. atomic weight is the same as atomic mass. c. elements in the same group have the same number of electron shells. d. atomic number equals the number of neutrons in the nucleus of an atom.

Complete each row of the table below by filling in the missing prefix or missing exponent.

Use the half-reactions of the reaction au(oh)3 + hi -> au +i2 +h2o to answer the questions