Atomic Vocabulary Quiz

Match the letter of the definition to the word in the lefthand column.

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