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15 Cards in this Set
- Front
- Back
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atom
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the smallest particle of an element that still retains the properites of the element.
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atomic number
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number of protons in an atom's nucleus.
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average atomic mass
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weighted- average mass of the mixture of an element's isotopes.
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electron
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particles surrounding the center of an atom that have a charge of -1.
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electron cloud
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area around the nucleus of an atom where the atom's electrons are most likely to be found.
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electron dot diagram
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uses the symbol for an element and dots representing the number of electrons in the element's outer energy level.
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group
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vertical column in the periodic table.
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isotope
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atoms of the same element that have different numbers of neutrons.
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mass number
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sum of the number of protons and neutrons in an atom's nucleus
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neutron
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neutral particle, composed of quarks, inside the nucleus of an atom.
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nucleus
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postively charged center of an atom that contains protons and neutrons and is surrounded by a cloud of electrons.
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period
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horizontal row in the periodic table. the amount of time it takes one wavelength to pass a fixed point; is expressed in seconds.
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periodic table
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organized list of all known elements that are arranged by increasing atomic number and by changes in chemical and physical properties.
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proton
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particle, composed of quarks, inside the nucleus of an atom that has a charge of +1.
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quark
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particles of matter that make up proteins and neutrons.
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