1. Elemental Boron is a mixture of two isotopes, Boron- 11 and Boron- 10, of atomic mass 11.009 amu and 1-.013 amu respectively. The atomic mass of Boron recorded in the Periodic Table is 10.81 amu. Explain which isotope of Boron is more abundant, Boron- 11 and Boron- 10?
2. Determine the number of electrons in one mole of potassium ions, K+.