Atoms, Elements, Molecules - SMS 6th Grade

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Across
  1. 1. a substance that is composed of only one type of atom or molecule
  2. 3. smallest unit of matter that cannot be divided
  3. 4. one of the three basic subatomic particles that orbits around the nucleus and has a negative charge
  4. 5. the weight of an atom found on the periodic table. This number helps you find the number of neutrons
  5. 6. two or more separate elements. Can be made of a mixture of atoms and molecules
  6. 7. the center of the atom that contains the neutrons and protons
  7. 9. one of the three basic subatomic particles that is found in the nucleus and has a neutral (zero) charge
  8. 10. a pure substance made up of only one type of atom
Down
  1. 1. organizes all discovered chemical elements in rows and columns according to increasing atomic number
  2. 2. a group of atoms bonded together
  3. 3. a unique abbreviation for every element that always starts with a CAPITAL letter
  4. 5. a number found with every element on the periodic table that also determines how many protons are in each element
  5. 8. one of the three basic subatomic particles that is found in the nucleus and has a positive charge