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Description
Flashcards by Fiona Heathcote, updated more than 1 year ago
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Created by Fiona Heathcote
over 8 years ago
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| Question | Answer |
| Anion | A negatively charged ion |
| Atom | A fundamental building block of all materials. It consists of a cluster of protons and neutrons surrounded by a cloud of electrons. |
| Atomic model | Scientists’ representation of an atom determined by experiment and indirect observation. |
| Atomic number | The number of protons in a nucleus. The atomic number determines what type of atom it is. |
| Atomic symbol | A short-hand notation for describing at atom. It consists of the chemical symbol, atomic number and mass number. |
| Cation | A positively charged ion. |
| Compound | A pure substance made up of two or more different types of atom chemically joined. |
| Electron | A small negatively charged particle. Clouds of electrons surround the nucleus of an atom. |
| Electron configuration | The number of electrons in each of the electron shells of an atom. |
| Electron shell | Part of the electron cloud. It is a layer that surrounds the nucleus and can only hold a certain number of electrons. |
| Element | A substance made up of only one type of atom. |
| Ion | An atom that has lost or gained electrons and therefore has an electric charge. |
| Isotopes | Atoms that have the same number of protons but a different number of neutrons in their nucleus. |
| Mass number | The number of protons and neutrons in an atom. |
| Molecule | A cluster of atoms that makes up an element or compound. |
| Neutral | Having no overall charge. |
| Neutron | A particle with no electric charge. It is found in the nucleus of an atom. |
| Nucleus | A cluster of protons and neutrons at the centre of an atom. |
| Periodic table | Table showing all 118 known types of atoms (elements). |
| Proton | A positively charged particle in the nucleus. |
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