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Atomic Structure Pretest

atom nucleus protons neutrons
electrons electron cloud electron shell isotopes
atomic mass units atomic number mass number atomic mass

  1. Negatively charged subatomic particle found in the electron cloud.
  2. Positively charged subatomic particle found in the nucleus.
  3. Neutral subatomic particle found in the nucleus.
  4. Central part of an atom made up of the protons and neutrons.
  5. Atoms of the same element having different numbers of neutrons.
  6. Number of protons in an atom.
  7. Average of the masses of naturally occurring isotopes of an element, weighted by abundance.
  8. The space around the nucleus of the atom through which the electrons move.
  9. Mass of an atom in atom mass units it is the sum of the number of protons and neutrons.
  10. Energy level of an e- that we model as the distance an e- circles the nucleus.
  11. Tiniest particle of an element that has all the properties of the element.
  12. Unit to describe the mass of atoms, molecules and subatomic particles.

  1. What element is in group 4A, period 2?
  2. Find silicon on the periodic table. How many protons are in silicon?
  3. What is the atomic number of silicon?
  4. What is the atomic mass of silicon?
  5. What is the symbol for silicon?
  6. How many neutrons are in the most common isotope of silicon?
  7. In what group is silicon ?
  8. In what period is silicon?
  9. On the back of your answer sheet, draw a Bohr diagram for silicon.