Elements Crossword Puzzle, unit "At"

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Across
  1. 1. the entire universe is made of two things: matter and _____
  2. 5. the charge of an electron
  3. 6. has a positive charge and is in the nucleus of an atom
  4. 7. the center of an atom, it includes both protons and neutrons
  5. 10. What element has 8 protons and 8 neutrons?
  6. 11. (look at a periodic table, such as on At-3 or elsewhere on the internet) What element only has one proton and NO neutrons?
  7. 14. the charge of a neutron
  8. 16. the charge of a proton
  9. 17. anything that has mass and takes up space
Down
  1. 2. travels far outside the nucleus of an atom and has a negative charge
  2. 3. What is the element symbol of neon (atomic number = 10) ?
  3. 4. the _______ number of an element tells you how many protons it has
  4. 5. in the nucleus of an atom and has a neutral charge
  5. 8. (look at a periodic table, such as on At-3 or elsewhere on the internet) What element has an atomic number of six ?
  6. 9. Boron has an atomic mass of 11, but only 5 protons. How many neutrons does it have? Spell out the number
  7. 12. all knowns atoms are organized on the periodic table of ___________
  8. 13. an element’s atomic _____ is calculated by adding the number of protons and neutrons together
  9. 15. the building block of matter
  10. 18. Gold has an atomic number of 79. What is its symbol? (Fun fact, the Latin word for gold is “aurum”)