Physical Science 1.3

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Across
  1. 3. mass of a proton or neutron
  2. 5. type of atom that has the same number of protons and electrons
  3. 7. proposed the planetary model of the atom
  4. 9. able to be drawn into a thin wire
  5. 11. proposed the solid sphere model of the atom
  6. 12. elements that have the properties of both metals and nonmetals
  7. 14. part of an atom to is found outside the nucleus and has a negative charge
  8. 15. unit used to measure atoms
  9. 17. able to be flattened into thin sheets by compression force
  10. 18. part of an atom found in the nucleus with a positive charge
  11. 19. number of protons in an atoms nucleus
  12. 20. the most malleable and ductile of all elements
  13. 23. part of an atom located in the nucleus that has no charge
  14. 24. horizontal row of elements on the periodic table of elements
  15. 26. positively charged atoms
Down
  1. 1. elements that are on the right side of the periodic table
  2. 2. element with an atomic number of 3
  3. 4. atom of an element that has the same atomic number but a different number of neutrons different mass number
  4. 6. negatively charged atoms
  5. 8. element with an atomic number of 1
  6. 10. outermost level of electrons in an atom
  7. 13. weighted average mass of the isotopes of an element
  8. 16. largest group of elements on the period table
  9. 20. vertical column on a periodic table of elements
  10. 21. smallest unit into which an element can be divided and still maintain its properties
  11. 22. sum of all the protons and neutrons in an atom's nucleus
  12. 25. total number of electrons that can fit on Energy Level 2 of an atom