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atom
the smallest part of an element that still has the properties of that element
element
substance made up of only one atom. cannot be broken down any smaller
molecule
made of 2 or more of the same atom that are chemically combined
compound
made up of two or more different types of atom that are chemically combined
mixture
made of two or more compounds that are not chemically combined
proton
a possitivley charged ssubatomic particle found in the nucleus
electron
a negativley charged subatomic particle found in the shells
neutron
an uncharged subatomic particle found in the nucleus of an atom
periodic table
a table that is an arrangement of elements in order of increasing atomic, arranged in rows called periods and columns named groups
periods
horizontal rows in the periodic table that are in increasing proton number. Tells you the amount of shells the element has
groups
vertical columns in the periodic table where elements with similar physical and chemical properties are grouped together. Tells us how many electrons are in the outermost shell
group 1,2,7,8 names
alkali metals,alkaline earths,halogens,noble gases
alkali
a substance which reacts with an acid to form a salt and water. Alkali are bases that dissolve in water
halogen
group VII of the periodic table
noble gases
grooup VIII of the periodic table. Are not reactive
ionic bonding
occur when one atom loses and another atom gains electrons
compound
a compound is formed when 2 or more elements chemically combine
covalent bonding when atoms share electron
valency
combining power of an element
atomic number
number of protons in t
mass number
number of protons and neutrons