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19 Cards in this Set
- Front
- Back
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groups
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vertical columns in the periodic table
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electrons
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negatively charged particles
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dot diagram
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uses the symbol of the element and dots to represent the electrons in the outer energy level.
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chemical symbol
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an abbreviated way to write the name of an element.
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valence electron
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located in teh outer energy level
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nucleus
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a positively charged center
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mass number
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the sum of the number of protons and the number of neutrons in the nucleus of an atom.
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atomic number
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number of protons in a nucleus
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nonmetals
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elements to the right of the stairstep line on the perioidic table. most do not conduct heat and electricity well.
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neutrons
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no charged particles
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isotopes
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Atoms of the same element that have different numbers of neutrons
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protons
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positivly charged particles
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periodic table
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arrangement of elements
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quark
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smaller particles of protons and neutrons
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metals
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shiny and good cnductors of heat and electricity
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electron cloud
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the region where electrons move about
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average atomic mass
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the average mass of the mixture of tis isotopes
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periods
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the horizontal rows of elements in the periodic table
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metalloids
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have properties of both metals and non metals.
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