The Atom

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Across
  1. 2. half of the life that the element or atom lives
  2. 5. smallest particle in radioactive decay
  3. 8. negative charge ion
  4. 9. weighted average of all the isotope masses for a particular element
  5. 11. The arrangement of electrons around the nucleus of an atom.
  6. 12. positive charge ion
  7. 13. largest particle in radioactive decay
  8. 14. The sum of the protons and neutrons in the nucleus of an atom.
  9. 16. neutral charge in nucleus
  10. 17. The smallest particle of an element.
  11. 19. Versions of the same element with different numbers of neutrons.
Down
  1. 1. negative charge in nucleus
  2. 3. Dense, positively charged mass at the center of an atom.
  3. 4. ability of an atom to attract electrons in bonds
  4. 6. A visual model showing the most likely locations for the electrons in an atom.
  5. 7. This number identifies the element and is equal to the number of protons found in the nucleus
  6. 10. The weighted average mass of all of an element's isotopes' mass numbers (usually a decimal).
  7. 11. The possible energies that an electron in an atom can have.
  8. 15. any particle in an atom that has a charge
  9. 18. Positive charge in nucleus