Answer: Absolute dating is used to determine a precise age of a rock or fossil through radiometric dating methods. This uses radioactive minerals that occur in rocks and fossils almost like a geological clock. ... These isotopes break down at a constant rate over time through radioactive decay.
You will need a periodic table to help you answer this problem. The atomic numbers are arrange from lowest to highest in the periodic table. You can locate element number 55 to be Cesium with an atomic weight of 132.905 amu. So, you start from element 56. The following elements are:
56 Barium 137.328 amu
57 Lanthanium 138.905 amu
58 Cerium 140.116 amu
59 <span>Praseodymium 140.908 amu
60 Neodymium 144.243 amu
Neodymium is already greater than 144 amu. Therefore, these elements only include Barium, Lanthanium, Cerium and Praseodymium.</span>
Reaction won't occur
Because the activity of Cu is less than Al
Answer:
Explanation:
The strong bases have following properties:
1. In solution, strong bases ionize fully.
2. On dissolving the strong bases in water they produce all hydroxide ion which they have.
3. For strong bases the value of equilibrium constant (Kb ) is large.
4. In general the strong base ionizes completely means concentration of ions are greater means conductivity also greater.
5. For strong bases the value of equilibrium constant (Kb) is large, thus the value of dG0 is very large negative number.