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chaptor 17
vocab
| Term | Definition |
|---|---|
| atom | the smallest particle of an element that still retains the properties of the element |
| atomic number | number of protons in an atoms nucleus |
| average atomic mass | weighted average mass of the mixtures of an element isotopes |
| electron | surrounding the center of an atom that have a charge |
| electron cloud | area around the nucleus of an atom where the atom electron 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 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 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 arrange by increasing atomic numbers and by changes in chemical and physical properties |
| proton | particle compose of quarks inside the nucleus of an atom that has a charge |
| quark | particles of matter that make up protons and neutrons |
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