PS Unit 1: Atomic Structure

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Across
  1. 4. The basic unit of a chemical element.
  2. 6. A chemical bond that involves the sharing of electron pairs between atoms.
  3. 7. A stable subatomic particle with a charge of negative electricity, found in all atoms and acting as the primary carrier of electricity in solids.
  4. 9. A type of chemical bond that involves the electrostatic attraction between oppositely charged ions.
  5. 11. A 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. 12. A pure substance consisting of only one type of atom.
  7. 13. The mass of an atom of a chemical element expressed in atomic mass units.
  8. 16. A group of atoms bonded together, representing the smallest fundamental unit of a chemical compound.
  9. 17. A substance formed when two or more chemical elements are chemically bonded together.
  10. 20. The electrons in the outer shell of an atom that are available to form bonds with other atoms.
  11. 21. The amount of substance of a system that contains as many elementary entities as there are atoms in 12 g of carbon-12.
Down
  1. 1. The total number of protons and neutrons in a nucleus.
  2. 2. The number of protons in the nucleus of an atom, which determines the chemical properties of an element and its place in the periodic table.
  3. 3. A table of the chemical elements arranged in order of atomic number.
  4. 5. The number of constituent particles, usually atoms or molecules, that are contained in the amount of substance given by one mole, approximately 6.022 x 10^23.
  5. 8. Elements found in nature as pairs (consisting of two atoms)
  6. 10. Variants of a particular chemical element which differ in neutron number, and consequently in nucleon number.
  7. 14. A notation of one or two letters representing a chemical element.
  8. 15. A column of elements in the periodic table of the chemical elements.
  9. 18. A stable subatomic particle occurring in all atomic nuclei, with a positive electric charge equal in magnitude to that of an electron.
  10. 19. A horizontal row in the periodic table.