Chapter 16: Properties of Atoms & The Periodic Table

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Across
  1. 1. Uses the chemical symbol of an element surrounded by dots to represent the number of electrons in the outermost energy level.
  2. 3. The small, positively charged center of the atom.
  3. 4. Particles in the nucleus with an electric charge of 1+.
  4. 6. The horizontal rows of elements in the periodic table.
  5. 8. The smallest particle of an element that retains the element’s properties.
  6. 11. The number of protons in an atom’s nucleus is equal to this.
  7. 12. Particles with an electrical charge of 1-. They occupy the space surrounding the nucleus of an atom.
  8. 13. Elements are arranged by increasing atomic number and by periodic changes in physical and chemical properties.
  9. 14. The vertical columns in the periodic table.
Down
  1. 1. The area around the nucleus of an atom where electrons are most likely to be found.
  2. 2. Small particles that make up protons and neutrons.
  3. 5. The weighted average mass of all naturally occurring isotopes of an element, measured in atomic mass units (amu), according to their natural abundances.
  4. 7. The sum of the number of protons and the number of neutrons in the nucleus of an atom.
  5. 9. Atoms of the same element that have different numbers of neutrons.
  6. 10. Electrically charged neutral particles in the nucleus, they do not have a charge.