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Chapter 4 Glossary
Term | Definition |
---|---|
Atomic number | number of protons in an atom |
Atoms | the particles that make up all materials; the smallest part of a element that can take part in a chemical reaction |
Electron configuration | arrangements 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 |