30 which radioisotopes have the same decay mode and have half-lives greater than 1 hour?
(1) au-198 and n-16 (3) 1-131 and p-32
(2) ca-37 and fe-53 (4) tc-99 and u-233

It is important to wear proper protective equipment in lab even when not actively performing experiments because accidents can affect any researcher, even one not working on an experiment. select the best answer from the choices provided

How many grams of phosphorus are contained in 5.09 moles of phosphorus?

Which of these statements best explains why space exploration should be encouraged? it prepares humans to live without oxygen. it dispel myths about objects in space. it prevents comets and asteroids from striking earth. it creates technology to absorb harmful radiations in space.