1. Complete the following table:
symbol | Mass Number | Atomic Mass | Atomic Number | #neutrons | #protons | #electrons
Aluminum ion | 28 | | | | |
Phosphorus-31 | | | | | |
2. There are two naturally occurring isotopes of bromine as shown in the table:
Atomic Isotope | Isotopic Mass (amu) | Percent natural abundance
Bromine-79 | 78.9183 | 50.69%
Bromine-81 | | 49.31%
Using the atomic mass from the Periodic Table (79.904 amu), calculate the mass of Br-81.
3. There are two naturally occurring isotopes of copper as shown in the table:
Isotope | Isotopic Mass amu | % nat. abundance | #protons | #electrons | #neutrons
Cu-63 | 62.9296 | | | |
Cu-65 | | 30.85 | | |
Complete the table. Use 63.546 amu as the atomic mass for copper.
4. There are two naturally occurring isotopes of an imaginary element as shown below:
Isotope | Isotopic Mass(amu) | % nat. abundance
Im-134 | 134.023 |
Im-136 | 135.988 | 28.22
What is the atomic mass of the imaginary element (Im)?