This question is about atoms and isotopes.
An atom of element Y has:
Give the number of electrons and the number of neutrons in this atom of element Y. Choose answers from: 6, 8, 14, 20.
Table 1 shows information about two isotopes of element Z.
Table 1
| Isotope | Mass number | Percentage abundance (%) |
|---|---|---|
| Isotope A | 85 | 72.2 |
| Isotope B | 87 | 27.8 |
Calculate the relative atomic mass (ArA_rAr) of element Z.
Use Table 1 and the equation:
Ar=(mass number×percentage) of isotope A+(mass number×percentage) of isotope B100 A_r = \frac{(\text{mass number} \times \text{percentage}) \text{ of isotope A} + (\text{mass number} \times \text{percentage}) \text{ of isotope B}}{100} Ar=100(mass number×percentage) of isotope A+(mass number×percentage) of isotope BGive your answer to 3 significant figures.
Suggest the identity of element Z. Use the periodic table.
41 exam-style questions on AQA GCSE Chemistry 1.1 A simple model of the atom, symbols, relative atomic mass, electronic charge and isotopes, covering 1.1.1 Atoms, elements and compounds, 1.1.2 Mixtures, 1.1.3 The development of the model of the atom (common content with physics), 1.1.4 Relative electrical charges of subatomic particles, 1.1.5 Size and mass of atoms, 1.1.6 Relative atomic mass, and 1.1.7 Electronic structure. Each one has a worked solution and a mark scheme showing where the marks go.