The Periodic Table Of Elements Crossword

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Across
  1. 2. number of protons in an atom's nucleus
  2. 5. the first element on the periodic table
  3. 8. positively charged center of an atom that contains protons and neutrons and is surrounded by a cloud of electrons
  4. 13. smallest particle of an element that still retains the properties of the element
  5. 14. organized list of all known elements that are arranged by increasing atomic number and by changes in chemical and physical properties
  6. 17. area around the nucleus of an atom where the atom's electrons are most likely to be found
  7. 20. elements that are usually a gas or brittle solid at room temperature, not malleable or ductile, are not good conductors of heat and electricity, and are typically not shiny
Down
  1. 1. particle of matter that makes up protons and neutrons
  2. 3. particle surrounding the center of an atom that has a charge of 1-
  3. 4. a nonmetal element with atomic number 5
  4. 6. horizontal row in the periodic table
  5. 7. element that shares some properties with metals and some with nonmetals
  6. 9. vertical row in the periodic table
  7. 10. elements that are typically hard, shiny, solid, malleable, and are good conductors of heat and electricity
  8. 11. an element with an atomic mass of 65.38
  9. 12. neutral particle composed of quarks inside the nucleus of an atom
  10. 15. a metal element with 77 protons
  11. 16. particle composed of quarks inside the nucleus of an atom that has a charge of 1+
  12. 18. a radioactive nonmetal element with 86 protons
  13. 19. atoms of the same number that have different numbers of neutrons