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flashcards - 02:42 MATTER ANGSTROM ATOMIC NUMBER ELEMENT...

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02:42 MATTER Composed of atoms. (Atoms  constitute the lowest level of  organization of the human body) ANGSTROM The typical size of an atom  1 x 10 -10 meters   ATOMIC NUMBER The atomic number of an atom is  equal to the number of protons it  contains in its nucleus ELEMENT Simplest form of matter that has  unique physical and chemical  properties Tera 10 12 Giga 10 9 Mega 10 6 Kilo 10 3 Hecto 10 2 Deca 10 1 Deci 10 -1 Centi 10 -2 Milli 10 -3 Micro 10 -6 Nano 10 -9 Angst 10 -10 Pico 10 -12 DIATOMIC Some molecules are composed  only of two identical atoms MOLECULE  Groups of atoms held together in a  stable organization COMPOUND Molecules composed of two or more  different atoms
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VALENCE ELECTRON The electrons furthest from the  nucleus of an atom.  These  electrons are specifically important  such that they are responsible for  the chemical reactivity of an atom.
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