Chapter 18 Vocabulary
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11 terms
Terms | Definitions |
|---|---|
 Atom | smallest piece of matter that retains the property of the element |
| Atomic Number | number of proteins in an atom's nucleus |
| Average Atomic Mass | weighted-average mass of the mixture of an element's isotopes |
| Electron | negatively charged particles surrounding the center of an atom |
| Electron Cloud | area around the nucleus of an atom where the atom's electrons are most likely to be found |
| Electron Dot Diagram | uses the symbol for an element and dots representing the number of electrons in the element's outer energy level |
| Proton | positively charged particle,composed of quarks,inside the nucleus of an atom |
| Nucleus | positively charged center of an atom that contains protons ans neutrons and is surrounded by a cloud of electrons |
| Isotope | atoms of the same element that have different numbers of neutrons |
| Mass Number | sum of the number of protons and neutrons in an atom's nucleus |
| Neutron | neutral particle, composed of quarks,inside the nucleus of an atom |
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