1 wrinkle berry = 6.02 x 10^23 ruzziebumps. How many ruzziebumps equal 4 winkelberrys?

If a sample of radioactive isotopes takes 600 minutes to decay from 400 grams to 50 grams, what is the half-life of the isotope?

One student said that the investigation was not valid (a fair test). write a plan for the investigation that includes improvements to the method and apparatus

What does hund's rule state? a. an orbital can contain two electrons only if the electrons have opposite spins. b. an orbital can contain two electrons only if all other orbitals at that sublevel are empty. c. an orbital can contain two electrons only if the electrons have different energy levels. d. an orbital can contain two electrons only if all other orbitals in that sublevel contain at least one electron.