Science Hw

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Across
  1. 3. Radioactive metals found on the periodic table.
  2. 6. Group 1 on the periodic table.
  3. 7. atomic numbers 57–71
  4. 10. the electrostatic force of attraction between two oppositely charged ions.
  5. 14. a stable subatomic particle with a charge of negative electricity.
  6. 15. in a single covalent bond, both atoms in the bond contribute one ... in order to form a shared pair.
  7. 16. the arrangement of electrons in the orbitals of an atom or molecule.
  8. 19. Negatively charged ion
  9. 21. a subatomic particle of about the same mass as a proton but without an electric charge
  10. 22. the total number of protons and neutrons in a nucleus.
  11. 24. helium, neon, argon, krypton, xenon, and radon
  12. 25. The number of electrons in an atom's outermost ... governs its bonding behavior
  13. 27. Horizontal group on the periodic table
  14. 29. each of two or more forms of the same element that contain equal numbers of protons but different numbers of neutrons in their nuclei.
  15. 30. a particle representing a quantum of light or other electromagnetic radiation.
Down
  1. 1. the smallest particle of a chemical element that can exist
  2. 2. one of the stable states of constant energy that may be assumed by a physical system.
  3. 4. fluorine, chlorine, bromine, iodine, and astatine
  4. 5. a grouping of electrons surrounding the nucleus of an atom
  5. 8. an atom or molecule with a net electric charge due to the loss or gain of one or more electrons.
  6. 9. the central and most important part of an object
  7. 11. an element that has both metallic and nonmetallic properties, as arsenic, silicon, or boron.
  8. 12. iron, manganese, chromium, and copper
  9. 13. thing that is composed of two or more separate element
  10. 16. a state of a physical system that is higher in energy than the ground state.
  11. 17. Positively charged ion
  12. 18. the lowest energy state of an atom or other particle.
  13. 19. The letter found on the periodic tage to represent an element.
  14. 20. the number of protons in the nucleus of an atom, found on the periodic table.
  15. 23. electrons orbit the nucleus at set distances. When an electron changes orbits, it does so in a sudden quantum leap.
  16. 26. each of more than one hundred substances that cannot be chemically interconverted or broken down into simpler substances and are primary constituents of matter
  17. 28. Vertical groups on the periodic table