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5 Written questions

5 Matching questions

  1. radioactive isotope
  2. hydrogen bond
  3. compound
  4. energy level
  5. trace element
  1. a different states of potential energy for electrons in an atom
  2. b substance consisting of two or more elements combined in a fixed ratio
  3. c hydrogen atom covalently bonded to one electronegative atom is also attraced to another electronegative atom
  4. d one in which the nucleus decays spontaneously, giving off particles and energy
  5. e those required by an organism in only minute quantities

5 Multiple choice questions

  1. positively charged ion
  2. sharing two pairs of valence electrons
  3. charged atom
  4. atoms that have more neutrons than other atoms of the same element and therefore weigh more
  5. sum of protons plus neutrons in nucleus

5 True/False questions

  1. moleculetwo or more atoms held together by covalent bonds


  2. ionic bondholds atoms together, strongest are covalent and ionic bonds


  3. matteranything that has mass and takes up space


  4. atompositively charged ion


  5. van der Waals interactionouter electrons