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Science Vocab. 5
| Term | Definition |
|---|---|
| Atom | the smallest particle of an element that still retains the properties of the element |
| Atomic Number | number of protons in an nucleus |
| Average Atomic Mass | weighted-average mass of the mixture of an elements isotopes |
| Electron | particles surrounding the center of an atom that have a charge |
| Electron Cloud | area around the nucleus of an atom where the atoms 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 elements outer energy level |
| Group | vertical column in the periodic table |
| Isotope | atoms of the same element that have different numbers of neutrons |
| Mass Number | sum of the number of protons and neutrons in an atoms nucleus |
| Neutron | neutral particle composed of quarks inside the nucleus of an atom |
| Nucleus | positively charged center of an atom that contains protons and neutrons and is surrounded by a cloud of electrons |
| Period | horizontal row in the periodic table |
| Periodic Table | organized list of all known elements that are arranged by increasing atomic number and by changes in chemical and physical properties |
| Proton | particle composed of quarks inside the nucleus of an atom that has a charge of 1+ |
| Quark | particles of matter that make up protons and neutrons |
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