How we calculate atomic mass of an element

- How can we calculate atomic mass of an element
- How do we calculate atomic mass of an element
- How do we calculate the average atomic mass of an element
- How do we calculate the relative atomic mass of an element
- How do we calculate the average atomic mass of three different isotopes of an element
- Chemistry atomic mass number
- How to find atomic number
- How we can find atomic number
- Как считать валентность химических элементов