Ch. 16 Physical Science

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Across
  1. 5. Because an atom does NOT have an overall ______, the number of electrons is equal to the number of protons
  2. 6. Atoms of the same element that have different number of neutrons
  3. 7. Electrons located in energy levels close to the nucleus have ______ energy
  4. 9. the nucleus contains protons and ____
  5. 11. the smallest particle of an element that retains the element’s properties
  6. 12. In a chemical _______, atoms are separated, combined, or rearranged.
  7. 14. Atoms are indivisible and indestructible
  8. 16. Different atoms combine in simple whole-number ratios to form _____
  9. 17. The area around the nucleus of an atom where electrons are most likely to be found
  10. 21. Atoms of a given element are identical in size, mass, and chemical ______
  11. 23. is the sum of protons and the number of neutrons in the nucleus of an atom
Down
  1. 1. particles in the nucleus with an electric charge of 1+
  2. 2. Particles of matter that makes up protons and neutrons
  3. 3. use the chemical symbol of an element surrounded by dots to represent the number of electrons in the outermost energy levels
  4. 4. The vertical columns on the periodic table
  5. 8. Elements in the same group have the same number of _______ in their outermost energy levels
  6. 10. An ____ quark has a charge of +⅔
  7. 11. The number of protons in an atom’s nucleus
  8. 13. Electrically neutral particles in the nucleus; they do not have a charge
  9. 15. the small, positively charged center of the atom
  10. 18. Periodic ___ is the organized list of all known elements that are arranged by increasing atomic number and by changes in chemical and physical properties
  11. 19. A _____ quark has a charge of -⅓
  12. 20. Periods are the ______ rows on the periodic table
  13. 22. There are 7 ___ on the periodic table