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Term | Definition |
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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 atomĀ“s central region, which is made up of |
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 |