Periodic Table Earth and Space

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Across
  1. 3. subatomic particle without charge
  2. 4. an atom or molecule that has gained or lost one or more electrons
  3. 5. the number of protons plus the number of neutrons in an atom
  4. 8. a horizontal row of elements in the periodic table
  5. 9. atom with the same number of protons but a different number of neutrons as other atoms of the elements
  6. 10. vertical column of elements on periodic table
Down
  1. 1. positively charged subatomic particles
  2. 2. the number of protons in a atoms nucleus
  3. 3. made up of protons and neutrons, the middle of an atom
  4. 6. negatively charged subatomic particle
  5. 7. smallest particle of en element