1. A 50 gram sample of a radioisotope decays to 12.5 grams in 14.4 seconds. What is the half-life of this isotope?

If 10.g of agno3 is available, what volume of 0.25 m agno3 can be prepared

What are the first two quantum numbers for the electrons located in subshell 4d? what are the first three quantum numbers for the electrons located in subshell 2s? how many electrons can be held in a sublevel l = 3? how many electrons can be held in the energy level n = 4? how many electrons in an atom can share the quantum numbers n = 4 and l = 3?

Molecular iodine, i2(g), dissociates into iodine atoms at 625 k with a first-order rate constant of 0.271 s−1. part a part complete what is the half-life for this reaction?