Atoms crossword

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Across
  1. 2. the positively charged central core of an atom
  2. 5. an atom with more electrons than protons
  3. 8. a subatomic particle of about the same mass as a proton but without an electric charge
  4. 9. the smallest particle of a substance having all the characteristics of the substance and is composed of one or more atom
  5. 11. one of the stable states of constant energy that may be assumed by a physical system
  6. 13. the system of electrons surrounding the nucleus of an atom
  7. 14. Seven Ringed zones (one for each row on the periodic table) around the nucleus of an atom where electrons may be found
  8. 16. A simple model of the atom contains a positively charged nucleus orbited by negatively charged electrons in specific orbital shells or energy levels
  9. 17. an atom with more protons than electrons
  10. 22. an atom with more protons than electrons
  11. 24. something made up of 2 or more atoms held together by bonds
  12. 25. number the total number of protons and neutrons in a nucleus
  13. 27. a particle smaller than an atom
  14. 28. Are formed when atoms transfer electrons to become stable compounds.
  15. 30. A form of electric charge, designated negative, positive, or neutral
Down
  1. 1. the number of electrons that fit in the electron layer closest to the nucleus
  2. 3. a stable subatomic particle with a charge of negative electricity
  3. 4. a single electron or one of two or more electrons in the outer shell of an atom that is responsible for the chemical properties of the atom
  4. 6. Are formed when atoms share electrons to become stable
  5. 7. a stable subatomic particle occurring in all atomic nuclei, with a positive electric charge
  6. 10. consists of a nucleus with the the area surrounding it showing where electrons are most likely to be found
  7. 12. anything that has weight and takes up space
  8. 15. An element is substance with atoms that are all alike
  9. 18. the mass of an atom of a chemical element expressed in atomic mass units
  10. 19. each of two or more forms of the same element that contain equal numbers of protons but different numbers of neutrons in their nuclei,
  11. 20. the energy level of a physical system (as an atom) having the least energy of all its possible states
  12. 21. are formed when atoms give away or receive electrons
  13. 23. There may be no more than two electrons in the first shell, no more then eight electrons in the second shell and no more than eight electrons on the third shell until the forth shell is completely filled up
  14. 26. the number of protons in the nucleus of an atom
  15. 29. the number of electrons that fit in the second electron layer