GCSE Chemistry practice questions on atomic structure and isotopes. Try 3 for free below — with hints, the answer and why the wrong answers are tempting. GCSE Beast has 18 questions on this topic.
A science museum is building a large model of an atom. Each particle in the model has a card giving its relative charge, its relative mass and where it is found in the atom.
Which row is correct for the card about a neutron?
| relative charge | relative mass | where it is found | |
|---|---|---|---|
| A | −1 | 1/1836 | in shells around the nucleus |
| B | 0 | 1/1836 | in the nucleus |
| C | 0 | 1 | in the nucleus |
| D | 0 | 1 | in shells around the nucleus |
Fig. 1 shows part of the Periodic Table. The letters are not the symbols of the elements.
An atom of element E has the electronic configuration 2,8,5.
Which letter shows the position of element E?
Fig. 1
The tips of some spark plugs are made of iridium. Iridium has two isotopes, iridium-191 and iridium-193. The relative atomic mass of iridium is 192.2.
What is the percentage of iridium-191 atoms in iridium?