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19 Cards in this Set

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