A neutral atom contains 11 protons and 12 neutrons.
Which row gives the number of electrons and the approximate relative mass of its nucleus?
| Row | Number of electrons | Relative mass of nucleus |
|---|---|---|
| P | 11 | 23 |
| Q | 12 | 23 |
| R | 11 | 11 |
| S | 23 | 12 |
Which row is correct?
row Q
row R
row S
row P
94 exam-style questions on Edexcel GCSE Physics 10.1 Circuits, charge and current, covering 10.1.1 Structure of the atom, 10.1.2 Circuit diagrams and symbols, 10.1.3 Series and parallel circuits, 10.1.4 Potential difference and voltmeters, 10.1.5 Energy transferred, charge and potential difference, and 10.1.6 Current, ammeters and charge flow. Each one has a worked solution and a mark scheme showing where the marks go.