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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 |