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Science Semester 2 Final part 1

STUDY
PLAY
Validity
extent to which a test measures what it claims to measure
Atom
the smallest component of an element having the chemical properties of the element
Atomic Symbol
an abbreviation for an element derived from the first one or two letters of the elements name
Nucleus
the core of an atom, consisting of two basic subatomic particles-protons and neutrons
Atomic Number
the number that designates the identity of an element, which is the number of protons in the nucleus
Mass Number
the number associated with an atom that is the same as the number of protons plus neutrons in its nucleus
Proton
electric charge=positive charge
Location in an atom=atomic nucleus
Neutron
electric charge=electrically neutral
location in an atom=atomic nucleus
Electron
electric charge=negative charge
location in an atom=negative charged particles
Element
a fundamental material consisting of only one type of atom
Compound
a material in which atoms of different elements are chemically held to one another
Metal
element that is generally shiny, opaque, malleable, ductile and a good conductior of electricity and heat
Metalloid
(18 on Period Table) exhibits both metallic and non metallic properties
Nonmetals
an element that is nonmalleable, non ductile, and a poor conductor of electricity and heat
Periodic Table
highly organized chart listing all the known elements
group
a vertical column in the periodic table
period
a horizontal column in the periodic table