Table 1 shows some information about three subatomic particles.
Complete Table 1 by giving the missing values for (i), (ii), and (iii).
| Subatomic particle | Relative mass | Relative charge |
|---|---|---|
| proton | 1 | (i) |
| neutron | (ii) | 0 |
| electron | (iii) | -1 |
Table 2 shows the number of protons, neutrons, and electrons in particles P, Q, R, S, and T.
| Particle | Number of protons | Number of neutrons | Number of electrons |
|---|---|---|---|
| P | 8 | 8 | 10 |
| Q | 12 | 12 | 10 |
| R | 9 | 10 | 9 |
| S | 19 | 20 | 19 |
| T | 10 | 10 | 10 |
Use Table 2 to answer these questions.
Each particle, P, Q, R, S, and T, may be used once, more than once, or not at all.
(i) State which particle has the lowest mass number.
(ii) State which particle contains only one electron in its outer shell.
(iii) State which particle is a positive ion.
(iv) State which particle is an atom of an element in Group 0 (noble gases) of the Periodic Table.
Which of these statements is correct for two neutral atoms of the isotopes oxygen-16 and oxygen-18?
41 exam-style questions on Edexcel IGCSE Chemistry Atomic structure. Each one has a worked solution and a mark scheme showing where the marks go.