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Atoms and Periodic Table Review

Terms in this set (22)

atom
the smallest unit of an element that maintains the properties of that element
electron
a subatomic particle that has a negative charge
nucleus
the central part of an atom, which is made up of protons and neutrons
electron cloud
a region around the nucleus of an atom where electrons are likely to be found
proton
A subatomic particle that has a positive charge and that is found in the nucleus of an atom
atomic mass unit
a unit of mass of an atom
neutron
a subatomic particle that has no charge and that is found in the nucleus
atomic number
the number of protons in the nucleus of an atom
isotope
an atom of an element that has the same number of protons but different number of neutrons
mass number
the sum of the number of protons and neutrons in the nucleus of an atom
periodic
describes something that occurs or repeats at regular intervals
periodic law
the law that states that the repeating chemical and physical properties of elements change periodically with the atomic numbers of the elements
period
the horizontal row of elements in the periodic table
group
vertical column of elements in the periodic table
metals
an element that is shiny and that conducts heat and electricity well
nonmetal
an element that is a poor conductor of heat and electricity
metalloid
an element that has properties of both metals and nonmetals
ductile
is the ability of a substance to be pulled into a wire
shiny
a property of an element that allows it to reflect light
malleable
capable of being shaped or beat into a flat sheet
thermal conductivty
the ability of a material to transfer heat energy from one molecule to the next by conduction
brittle
breaks easily
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