15) Iridium-192 is refined into wire and used to deliver (internally) radioactivity to cancer cells in a tumor (eventually the wire is removed). Iridium-192 has a half life of
14 days. Initially you have a 36 g sample of iridium-192. Later the mass is 14.5 g. How many days have passed? For this problem, quote your answer to the nearest
whole number.

ch3 [ch2]14cooh

explanation:

since the atomic number is the number of protons in the nucleus, as we move to the left on the periodic table, the electrostatic pull between the nucleus and the valence electron shell decreases. as we move down a group (vertical column), the valence shell energy level gets further and further from the nucleus.

he uptake of drugs from the intestine is often strongly influenced by diffusion. for example, consider a water-insoluble steroid for treating inflammation that is solubilized in aggregates of detergent molecules, called micelles. these micelles, aggregates of 80 soap molecules, have a molecular weight of 24,000, a diameter of 2.6 nm, and a charge of -27. the positively charge ions (counterions) in this system are na".