Potassium- 40 can also be used to date biological fossils since potassium is found living organisms. Potassium-40 has a half- life of 1.28 billion years. Potassium-40 decays to the daughter isotope argon-40. There is 20% of the original potassium-40 remaining. How old is the sample? What type of fossil might this be?

Imagine if during the cathode ray experiment, the size of the particles of the ray was the same as the size of the atom forming the cathode. which other model or scientific observation would have also been supported? 1. this would support dalton's postulates that proposed the atoms are indivisible because no small particles are involved. 2. this would support bohr's prediction about electrons moving in orbits having specific energy. 3. this would support bohr's prediction about electrons being randomly scattered around the nucleus in the atom. 4. this would support dalton's postulates that proposed that atoms combine in fixed whole number ratios to form compounds.