A sodium atom can be represented as 1123Na^{23}_{11}\text{Na}1123Na. This atom forms a sodium ion, Na+\text{Na}^+Na+.
Which row in the table shows the correct number of protons and neutrons in this sodium ion, Na+\text{Na}^+Na+?
| Number of protons | Number of neutrons | |
|---|---|---|
| A | 11 | 11 |
| B | 11 | 12 |
| C | 12 | 11 |
| D | 12 | 12 |
A
B
C
D
87 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.