radiocontrast dyes are considered safe because the isotopes have short half-lives and the isotopes coat the gastrointestinal tract and are not absorbed by normal tissue. if a patient ingests 10.0 mg of iodine, how long until the iodine-134 is 99% out of the patient's system if the half-life of iodine-134 is 52.6 minutes?

Why are the trends and exceptions to the trends in ionization energy observed?

If two objects at different te, peraure are in contact with each other what happens to their temperature

Which of these statements is correct about plastic and concrete? a) both plastic and concrete are minerals because they are natural, solid materials. b) both plastic and concrete are not minerals because they are made by humans. c) plastic is a mineral because it has a definite crystal structure but concrete is not a mineral because it is organic. d) plastic is not a mineral because it is not formed under the ground but concrete is a mineral because it has a definite composition.