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Lecture Notes for CHEM 1035 - General Chemistry at Virginia Tech (VT)

Notes Information

Material Type:Study Guide 2
Professor:Staff
Class:CHEM 1035 - General Chemistry
Subject:Chemistry
University:Virginia Polytechnic Institute And State University
Term:Fall 2005
Keywords:
  • Chemical Property
  • Ionic Bonds
  • Other Molecules
  • No Molecules
  • The Nucleus
  • Covalent Bonds
  • Chemical Bonds
  • Either...or
  • Water Molecules
  • Vaporization
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Sample Document Text

Chapter Two Concept Review 2.1 Atoms are nature’s building material Atoms • All substances are composed of matter, and all matter is composed of atoms • Negatively charged electrons circle the nucleus of the atom, while the nucleus is composed of positively charged protons and neutrons • An atom’s atomic number refers to its number of protons while its atomic mass refers to the number of protons and neutrons • Isotopes are atoms of an element that possess different numbers of neutrons • Radioactive isotopes contain nuclei that spontaneously break up into elements with lower atomic numbers. The decay rate is expressed in terms of a half-life Electrons Determine the Chemical Behavior of Atoms • Elections circle the nucleus of an atom in orbitals. Because the orbitals are so large and are mostly composed of empty space, the nuclei of two atoms never come close enough in nature to interact with each other • Because electrons are attracted to the positively charged nucleus, work is necessary so t...

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