1. Which of the following elements would be stable (not radioactive) using the graph below? Calcium-57, Calcium-40, Astatine-220, Cesium-140, Bromine-79

2. Which combination of protons and neutrons below would be stable (not radioactive) using the graph above? 60 protons, 64 neutrons, 60 proton, 82 neutrons, 60 protons, 90 neutrons, 60 protons, 100 neutrons

For the following, determine the type of reaction and then give products.

Maria wants to determine which type of disinfectant kills the most bacteria. which of the following is the best way for maria to determine this? a. ask ten different companies that make disinfectants which type is best. b. put the same amount and species of bacteria on ten identical plates, and add ten different kinds of disinfectant to each plate. c. interview ten different people to determine which type of disinfectant they prefer. d. put the same amount and species of bacteria on ten identical plates, and add a different disinfectant to each plate.

What is the number of moles of chemical units represented by 9.03x10^24? and how do i show work? (dumb it down )