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5 Written questions

5 Matching questions

  1. isotopes
  2. molecule
  3. atomic number
  4. molecular formula
  5. Chemistry
  1. a The number of protons in an atom.
  2. b Indicates the elements and the number of atoms of each element that make up a molecule.
  3. c Two or more atoms sharing electrons.
  4. d The science of the structure and interactions of matter.
  5. e Atoms of an element that have different numbers of neutrons and therefore different mass numbers; most of them are stable and do not change over time.

5 Multiple choice questions

  1. An atom or group of atoms with an unpaired electron in the outermost shell; makes the atom unstable, highly reactive, and destructive to nearby molecules.
  2. Anything that occupies space and has mass.
  3. The eight lesser elements in the human body.
  4. The regions outside the nucleus that electrons move about in; depicted as simple circles around the nucleus; each region holds a specific number of electrons (2.8.18).
  5. Negatively charged particles located in a cloud, moving about the nucleus of an atom.

5 True/False questions

  1. subatomic particlesThe dozens of particles that compose atoms, namely protons, neutrons, and electrons.

          

  2. atomic mass (atomic weight)The number of protons in an atom.

          

  3. chemical symbolThe building blocks of all forms of matter -- both living and nonliving; cannot be split into a simpler substance by ordinary chemical means.

          

  4. neutrons (n⁰)Negatively charged particles located in a cloud, moving about the nucleus of an atom.

          

  5. compoundTwo or more atoms sharing electrons.