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Vocab chp.17
Physical science
| Term | Definition |
|---|---|
| Atom | The smallest particle of an element that still retains the properties of an element |
| Atomic number | Number of protons in a atom's nucleus |
| Average atomic mass | Weighted-average mass of the mixture of an element's isotopes |
| Electron | Particle surrounding the center of an atom that have the charge of 1- |
| 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 |
| Group | Vertical column in the periodic table |
| Isotope | Atom 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 |
| 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; The amount of time it takes one wavelength to pass a fixed point; is expressed in seconds |
| 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 the charge of 1+ |
| Quark | Particles of matter that make up protons and neutrons |
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brookmariemartin
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