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Term | Definition |
---|---|
atom | the smallest particle of an element that still retains the properties of an element. |
atomic number | number of protons in an atoms nucleus |
average atomic mass | weighted - average mass of the mixture of an elements isotopes. |
electron | particle surrounding the center of an atom and have a charge of -1 |
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 | atom of the same element that have a different number of neurons |
mass number | sum of the number of protons and neurons in an atoms nucleus |
neutron | neutral partial, composed of quarks, inside the nucleus of an atom |
nucleus | positively charged center of an atom that contains protons and neurons and its 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 | particle of matter that makes up protons and neutrons |