Atomic Structure crossword

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Across
  1. 2. The smallest piece of matter that still retains the property of the elements.
  2. 3. Atoms of the same elements that have different numbers of neutrons.
  3. 6. protons and neutrons are found in a small, positively charged center of the atom that is surrounded by a cloud containing electrons.
  4. 7. The vertical columns in the periodic table.
  5. 8. Cloud- The area around the nucleus of an atom where its electrons are most likely found.
  6. 10. Particles with an electric charge of 1+.
  7. 11. mass- The sum of the number of protons and neutrons in the nucleus of the atom.
  8. 12. The horizontal line of elements on the periodic table.
Down
  1. 1. The salt form of a liquid or gas element.
  2. 4. Particles with an electric charge of 1-.
  3. 5. A building block of subatomic particles.
  4. 6. Natural particles that do not have an electric charge.
  5. 9. number- The number of protons in an atom is equal to a number.
  6. 10. table- The elements are arranged by increasing atomic numbers and by changes in physical and chemical properties.