The phase change in which a substance changes from a gas directly to a solid is
a. condensation.
b. vaporization.
c. deposition.
d. sublimation

Which of the following methods uses the decay of atomic particles in an object to find its exact age? a. fossil dating b. geologic dating c. radioactive dating d. relative dating

What happens to isotopes that are unstable?

Use this information to determine the number of calends electrons in the atoms. which of the following correctly compares the stability of the two atoms? a) both are unreactive b) both are highly reactive c) a is unreactive and d is reactive d) a is reactive and d is unreactive