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| Questão | Responda |
| Structure of an atom? | |
| What is a proton? | A tiny positive particle found inside the nucleus of an atom |
| What is a neutron? | A dense particle found in the nucleus of an atom. It is electrically neutral, carrying no charge |
| What is meant by an 'atomic number'? | The number of protons (which equals the number of electrons) in an atom. It is sometimes called the proton number. |
| What is meant by the 'mass number'? | The number of protons plus neutrons in the nucleus of an atom. |
| What is meant by 'electronic structure'? | A set of numbers to show the arrangement of electrons in their shells (or energy levels), for example, the electronic structure for potassium is 2, 8, 8, 1 |
| What is a meant by a 'compound'? | A substance made when two or more elements are chemically bonded together. For example, water (H20) is a compound made from hydrogen and oxygen. |
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