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Matter: Atoms Vocabulary
Fall 2015
Matter = anything that has mass and takes up space (volume)
Mass = measure of the amount of particles in a substance [unit=grams (g)]
Volume = the amount of space taken up by a substance [unit= liters (L) or Cubic Centimeters
(cm3)]
*Element = a substance that cannot be broken down or separated into simpler substances by
chemical means
*Atom = the smallest unit of an element that has all the properties of (makes up) that element
Atomic Nucleus =center of an atom that contains the protons and neutrons and accounts for
most of the MASS of the atom
Electron Cloud = the area surrounding the nucleus of an atom that contains electrons in their
orbits; accounts for most of the SPACE taken up by the atom
*Protons: positively charged subatomic particles
*Neutrons: neutrally charged subatomic particles
*Electron: the subatomic particle with a negative charge and relatively no mass
Valence electron = an electron that is found in the outermost shell of an atom that determines
the atoms chemical properties
*Atomic mass = equals the number of protons plus the number of neutrons
*Atomic number = the number of protons in an atom and it is the property for organization of
the periodic table (PT)
*Chemical Symbol – one or two letters representing an element – first is capital/second is lower
case
Ion = Atom or group of atoms with a positive or negative electric charges. Positively charged
ions are cations, negatively charged ones anions
Neutral = atom or group of atom with no electric charge
 I can identify parts of atoms
 I can use atomic structure to identify elements
 I can calculate the number of sub atomic particles in atoms using the
information in the Periodic Table of Elements
 I can describe the rules of how to read and write a chemical symbols
Matter: Atoms Vocabulary
Fall 2015
Matter = anything that has mass and takes up space (volume)
Mass = measure of the amount of particles in a substance [unit=grams (g)]
Volume = the amount of space taken up by a substance [unit= liters (L) or Cubic Centimeters
(cm3)]
*Element = a substance that cannot be broken down or separated into simpler substances by
chemical means
*Atom = the smallest unit of an element that has all the properties of (makes up) that element
Atomic Nucleus =center of an atom that contains the protons and neutrons and accounts for
most of the MASS of the atom
Electron Cloud = the area surrounding the nucleus of an atom that contains electrons in their
orbits; accounts for most of the SPACE taken up by the atom
*Protons: positively charged subatomic particles
*Neutrons: neutrally charged subatomic particles
*Electron: the subatomic particle with a negative charge and relatively no mass
Valence electron = an electron that is found in the outermost shell of an atom that determines
the atoms chemical properties
*Atomic mass = equals the number of protons plus the number of neutrons
*Atomic number = the number of protons in an atom and it is the property for organization of
the periodic table (PT)
*Chemical Symbol – one or two letters representing an element – first is capital/second is lower
case
Ion = Atom or group of atoms with a positive or negative electric charges. Positively charged
ions are cations, negatively charged ones anions
Neutral = atom or group of atom with no electric charge
 I can identify parts of atoms
 I can use atomic structure to identify elements
 I can calculate the number of sub atomic particles in atoms using the
information in the Periodic Table of Elements
 I can describe the rules of how to read and write a chemical symbols