Earth and Space

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Across
  1. 3. Horizontal row of elements on the periodic table
  2. 6. Neutrally charged particles
  3. 7. The number of protons and neutrons added up in the nucleus
  4. 8. The outer areas where electrons are
  5. 10. group of atoms held together by a chemical bond
Down
  1. 1. Vertical column on the periodic table
  2. 2. Positively charge particles
  3. 4. Negatively charged particles
  4. 5. The number of protons in the nucleus of an atom
  5. 9. Smallest particle an element can be divided and still be that element