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