The radioactive isotope z has a half-life of 12 hours. after 2 days, the fraction of the original amount remaining is

Abullet found at a crime scene may be used as evidence in a trial if the percentage of metals match to the composition of metals in a bullet from the suspect's ammunition. a forensic scientist's analysis of the bullet shows that it contains 11.9 g of lead, 0.5 g of tin, and 0.8 b of antimony. what is the percentage of lead metal in the bullet? express your answers to the one's place.

How are isotopes of the same chemical element alike? how are they different?

Which of the following is not one of the steps in the scientific method a. hypothesize b. summarize c. analyze d. familiarize