4.1 A certain element, X, has two isotopes in nature. One isotope has an atomic mass of 106,9 amu. The percentage appearance of this isotope is 50%.
The atomic mass of the other isotope is 109,1.
4.1.1 Define the term isotope. (2)
4.1.2 Calculate the relative atomic mass of element X. (5)
4.1.3 Identify element X in QUESTION 4.1.2. (2)
4.2 Complete the table below. Write only the answer next to the question number (4.2.1–4.2.7).
