The table shows the numbers of subatomic particles in four particles, W, X, Y and Z.
| Particle | Protons | Neutrons | Electrons |
|---|---|---|---|
| W | 17 | 18 | 17 |
| X | 17 | 20 | 18 |
| Y | 18 | 20 | 18 |
| Z | 19 | 20 | 18 |
Statement 1: X and Y are particles of the same element because they have the same number of electrons
Statement 2: Z has a mass number of 39 and a charge of 1+
Statement 3: W and X are particles of the same element
Which statements are correct?
1 and 2 only
2 and 3 only
3 only
1, 2 and 3
46 exam-style questions on Edexcel GCSE Chemistry 2.1 Atomic structure, covering 2.1.1 Development of the atomic model, 2.1.2 Structure of the atom and subatomic particles, 2.1.3 Mass number, isotopes and relative atomic mass, and 2.1.4 Calculating relative atomic mass from isotopic abundance. Each one has a worked solution and a mark scheme showing where the marks go.