Chapter 4 Crossword Puzzle

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Across
  1. 3. The total number of protons and neutrons in a nucleus.
  2. 4. Each of the actual or potential patterns of electron density that may be formed in an atom or molecule by one or more electrons.
  3. 6. A stable subatomic particle occurring in all atomic nuclei.
  4. 8. A stable subatomic particle with a charge of negative electricity.
  5. 9. Subatomic particle of about the same mass as a proton but without an electric charge, present in all atomic nuclei except those of ordinary hydrogen.
  6. 11. Ice forming into liquid.
  7. 12. Each of two or more forms of the same element that contain equal numbers of protons but different numbers of neutrons in their nucleimole
Down
  1. 1. Number of protons in the nucleus of an atom, which determines the chemical properties of an element and its place in the periodic table.
  2. 2. With a positive electric charge equal in magnitude to that of an electron, but of opposite sign.
  3. 5. The base unit of amount of substance in the International System of Units.
  4. 7. Basic unit of a chemical element.
  5. 10. A membrane-bound organelle that contains the cell's chromosomes.