Atomic Structure & Periodic Table

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Across
  1. 3. subatomic particle that has negative charge
  2. 5. the sum of number of protons and neutrons in an atom
  3. 6. a horizontal row of elements in the periodic table
  4. 8. an atom’s central region made of protons and neutrons
  5. 9. a vertical column of elements in the periodic table
  6. 10. subatomic particle that is neutral in charge
  7. 11. the number of protons in an atom
Down
  1. 1. a region around the nucleus where electrons are located
  2. 2. electrons in the outermost orbital
  3. 4. subatomic particle that has positive charge
  4. 7. atoms with same number of protons but different number of neutrons
  5. 12. a charged atom by losing or gaining electrons