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Term | Definition |
---|---|
Atom | The smallest unit of an element that maintains the properties of that element. |
Element | A substance that cannot be separated or broken down into simpler substances by chemical means. |
Nucleus | In physical science, an atoms central region, which is made up of protons and neutrons. |
Proton | A subatomic particle that has a positive charge and that is found in the nucleus of an atom. |
Neutron | A subatomic particle that has no charge and that is found in the nucleus of an atom |
Electron | A subatomic particle that has a negative charge. |
Atomic Number | The number of protons in the nucleus of an atom; the atomic number is the same for all atoms of an element. |
Neutral | Having no overall charge. |
Atomic mass | The mass of an atom expressed in atomic mass units. |
Chemical symbol | A one- or two- letter code that represents an element. |