Isotopes - Page 3
Questions
- Rubidium is a soft, silvery-white metal that has two common isotopes, #""^85 Rb# and #""^87 Rb#. If the abundance of #""^85 Rb# is 80.2% and the abundance of #""^87 Rb# is 19.8%, what is the average atomic mass of rubidium,?
- The atomic mass of silver found in nature is Ar (Ag) = 107,983. This silver is made of 107Ag and 109Ag Isotopes. Calculate the proportion of mass of 107Ag isotope which is in natural silver atoms?
- How can chlorine have an atomic mass of #35.45*"amu"#?
- Naturally occurring uranium contains 0.72 percent of the isotope uranium-235. What is the mass of uranium-235 in 2,000 kg of naturally-occurring uranium?
- What unit is used for average atomic mass?
- How do isotopes of an element differ? In what ways are they the same?
- Boron has two isotopes, boron-10 and boron-11. Boron-10 has five protons and five neutrons. How many protons and neutrons does boron-11 have? Explain.
- The isotope sodium-20 has how many neutrons?
- How does the radioactive isotope C-14 differ from C-12?
- Oxygen is composed of three isotopes 16/8 O (15.995 u), 17/8 O (16.999 u) and 18/8 O (17.999 u). One of these isotopes, 17/8 O, comprises of 0.037% of oxygen. What is the percentage abundance of the other two isotopes, using the average atomic mass of 15.9994 u.
- How do isotopes of carbon differ from one another?
- What is a radioisotope?
- What are neutrons and why are they important to isotopes?
- The isotope Francium 224 has a half life of 20 minutes. A sample of the isotope has an initial activity of 9-- disintegrations s^-1. The approximate activity of the sample an hour later will be what? Multiple choice question. Please explain why for answer
- What is relative abundance of an isotope?
- How many neutrons are found in the unstable isotope phosphorus-36?
- How do different isotopes of the same element differ?
- What is the difference between an atom and isotope?
- Sulfur has an atomic number of 16. You have found an isotope that has a mass of 35. What is different about this isotope than a sulfur atom with a mass of 32?
- Why is the atomic mass of iodine-131 not #"126.904 g/mol"#?