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b9-b32 bold words
things
18
Science
6th Grade
11/10/2008

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Term
proton
Definition
positively charged particle
Term
neutron
Definition
uncharged particle
Term
nucleus
Definition
combination of protons and neutrons
Term
electron
Definition
negatively charged particles that move around outside the nucleus
Term
atomic number
Definition
identity of an atom is determined by the number of protons in its nucleus
Term
atomic mass number
Definition
total number of protons and neutrons in an atom's nucleus
Term
isotope
Definition
atoms of the same element that have a different number of neutrons
Term
ion
Definition
formed when an atom looses or gains one or more electrons
Term
atomic mass
Definition
average mass of all the atoms of an element
Term
periodic table
Definition
it shows periodic, or repeating, pattern of properties of the elements
Term
group
Definition
elements in a column in the periodic table
Term
period
Definition
horizontal row in the periodic table
Term
reactive
Definition
indicates how likely an element is to undergo a chemical change
Term
metals
Definition
elements that conduct electricity, heat well and have a shiny appearance
Term
nonmetals
Definition
properties opposite of those of metals
Term
metalloids
Definition
elements that have properties of metals and nonmetals
Term
radioactivity
Definition
process where atoms produce energy and particles
Term
half-life
Definition
amount of time that it takes for one-half of the atoms in a particular sample to decay
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