What is the definition of half-life? the variable rate at which one half of a given radioisotope decays an observable pattern in the order at which one half of a radioisotope decays the time required for one half of a sample of a radioisotope to decay

Anurse practitioner prepares an injection of promethazine, an antihistamine used to treat allergic rhinitis. if the stock bottle is labeled 25 mg/ml and the order is a dose of 11.0 mg , how many milliliters will the nurse draw up in the syringe?

Asingle atom of an element has 21 neutrons, 20 electrons, and 20 protons. which element is it? ok o z

16. in a reaction that has reached equilibrium, a. the forward and reverse reactions are occurring at the same rate. b. the reactants and products are in equal concentrations. c. the forward reaction has gone further than the reverse reaction. d. there are equal numbers of atoms on both sides of the equation. e. a, b, and d are correct.