science

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Across
  1. 1. an atom or group of atoms that has a positive or negative electric charge
  2. 4. the number of protons and neutrons in an atom's nucleus
  3. 6. a positively charged particle that is located in the nucleus
  4. 7. the total number of protons and neutrons in a nucleus
  5. 10. a particle that has no electric charge and is located in the nucleus of an atom
  6. 12. the length of time for it to take
  7. 14. a negatively charged particle located outside of the atom's nucleus
  8. 15. a horizontal row in the periodic table of elements
Down
  1. 2. the central region of an atom where most of the atom's mass is found in protons and neutrons
  2. 3. a table of element's that is arranged by atomic numbers that show patterns of their properties
  3. 5. an element that is not a metal and has properties that are generally opposite of the one's metal
  4. 8. an element that tends to be shiny easily shaped and a good conductor of electricity and heat
  5. 9. an element that has properties of both metals and nonmetals
  6. 11. a vertical column in the periodic table of elements
  7. 13. an atom of one element that has different numbers of neutrons than another atom of the same element