Science Crossword

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Across
  1. 2. the smallest particle of a chemical element that can exist
  2. 3. one of the stable states of constant energy that may be assumed by a physical system
  3. 7. an element (e.g. arsenic, antimony, or tin) whose properties are intermediate between those of metals and solid non-metals or semiconductors.
  4. 8. any of the elements fluorine, chlorine, bromine, iodine, and astatine
  5. 12. The outer shell of an atom
  6. 14. any of the set of metallic elements occupying a central block (Groups IVB–VIII, IB, and IIB, or 4–12) in the periodic table, e.g. iron, manganese, chromium, and copper.
  7. 17. The verticals on the periodic table
  8. 18. a stable subatomic particle with a charge of negative electricity, found in all atoms and acting as the primary carrier of electricity in solids.
  9. 20. a particle representing a quantum of light or other electromagnetic radiation. A photon carries energy proportional to the radiation frequency but has zero rest mass.
  10. 21. The horizontals on the periodic table
  11. 23. any of the series of fifteen metallic elements from lanthanum to lutetium in the periodic table (atomic numbers 57–71).
  12. 26. the complete transfer of valence electron(s) between atoms.
  13. 29. each of more than one hundred substances that cannot be chemically interconverted or broken down into simpler substances
  14. 31. A combination of letters to help identify atoms
Down
  1. 1. The concept of an electron being able to jump from cell to cell
  2. 4. result from the absorption of energy by the outermost, or valence, electrons of an atom that cause a jump to higher energy shells or orbitals.
  3. 5. The electrons on the shell furthest from the atom
  4. 6. The lowest energy state or most stable state of an atom, molecule or ion.
  5. 9. the number of protons in the nucleus of an atom, which is characteristic of a chemical element and determines its place in the periodic table.
  6. 10. The shell furthest than the atom
  7. 11. the arrangement of electrons in the orbitals of an atom or molecule.
  8. 13. composed of two or more separate elements
  9. 15. 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.
  10. 16. The command center of a cell
  11. 19. The total number of protons and neutrons in a nucleus.
  12. 22. any of the elements lithium, sodium, potassium, rubidium, caesium, and francium
  13. 24. A negatively charged ion
  14. 25. ach of two or more forms of the same element that contain equal numbers of protons but different numbers of neutrons in their nuclei.
  15. 27. A positively charged ion
  16. 28. any of the series of fifteen metallic elements from actinium (atomic number 89) to lawrencium (atomic number 103)
  17. 30. an atom or molecule with a net electric charge due to the loss or gain of one or more electrons.