Studied by 4 peopleAlkali Metals
extremely reactive metals in group 1; do not occur freely in nature
Alkaline-earth metals
metallic elements in group 2; do not occur freely in nature
atom
smallest particle into which an element can be divided
atomic number
number of protons in the nucleus of an atom
average atomic mass
weighted average of the masses of all naturally occurring isotopes of that element
chemical symbol
abbreviation for an elements name
ductile
can be made into wires
electron
negatively charged particles in an atom
electron cloud
general region around the nucleus where electrons may be found
energy levels
electrons are organized here in specific rings
group
vertical column of elements on the periodic table, sometimes called a family
halogens
toxic, nonmetals in group 17
isotope
atom of an element with different number of neutrons
malleable
able to form different shapes, bendable
mass number
total number of protons and neutrons in an atom’s nucleus
metal
shiny element that conducts heat and electricity well
metalloid
elements that have some properties of metal and some properties of non metals
neutron
uncharged particles in the nucleus of an atom
noble gases
unreactive elements that have a full valence shell; group 18
nonmetal
poor conductor of heat and electricity
nucleus
small, dense center of an atom that is positively charged
period
horizontal row of elements on the periodic table
periodic table
arrangement of the elements in order of their atomic number such that elements with similar properties fall in the same column/group
proton
positively charged particles in the nucleus
valence electrons
electrons found in the outermost energy level of an atom
Note 
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