14. If one half-life is the amount of time it takes for a radioactive isotope to decay by a factor of 2, approximately which percent describes how much of the initial quantity of a substance would
remain after 2.3 half-lives?

Ageochemist examines a piece of metal that he found in the soil. he performs tests to identify the metal from its density, electrical conductivity, and melting point. which statement best describes his investigation? a. he is determining physical properties that are sufficient to identify the metal.b. he is determining chemical properties that are sufficient to identify the metal.c. he is determining physical properties that are insufficient to identify the metal.d. he is determining chemical properties that are insufficient to identify the metal.