Atoms, Molecules, Elements, and the Periodic Table

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Across
  1. 5. A group of atoms bonded together, representing the smallest unit of a chemical compound.
  2. 6. Chemical bond formed by the sharing of electrons between atoms.
  3. 8. Vertical column in the periodic table; elements in the same group have similar properties.
  4. 10. Atom's ability to attract and hold electrons.
  5. 13. Electron in the outermost energy level of an atom; involved in chemical bonding.
  6. 14. Atoms of the same element with different numbers of neutrons.
  7. 15. SI Unit for luminosity
  8. 16. Total number of protons and neutrons in an atom.
  9. 17. Negatively charged particle found outside the nucleus in electron shells.
  10. 18. A substance composed of two or more different elements chemically bonded together.
  11. 20. Force that holds atoms together in a compound.
  12. 22. SI Unit of Temperature
  13. 24. SI Unit of time
Down
  1. 1. SI Unit of mass
  2. 2. Horizontal row in the periodic table.
  3. 3. SI Unit of electric current
  4. 4. SI Unit of length
  5. 7. Neutral (no charge) particle found in the nucleus of an atom.
  6. 9. Positively charged particle found in the nucleus of an atom.
  7. 11. Pure substance made up of only one type of atom; it cannot be broken down into simpler substances by chemical means.
  8. 12. Chemical bond formed by the transfer of electrons from one atom to another.
  9. 19. SI Unit for amount of substance
  10. 21. A number named after the Italian scientist Amedeo A. that is 6.022×10^23
  11. 23. Central part of an atom, containing protons and neutrons.