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Atoms and Elements
Term | Definition |
---|---|
Atomic Number | Number of protons in an atom |
Atoms | The particles that make up all materials; the smallest part of an element that can take part in a chemical reaction |
Electron Configuration | Arrangement of electrons in electron shells |
Electron Shells | Also known as energy levels the regions surrounding the nucleus where electrons may be found |
Element | A substance composed of atoms with the same atomic number; 118 are known to exist |
Energy Levels | Also known as electron shells, the regions surrounding the nucleus where electrons may be found |
Ground State | The lowest energy arrangement of an atom's electrons in energy levels (shells) |
Indirect Evidence | Evidence that does not involve direct observation |
Nucleus | Heavy core at the centre of the atom, made of protons and neutrons |