Henry Smith Block 2 1.8

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Across
  1. 5. The central region of an atom where most of the atom’s mass is found in protons and neutrons.
  2. 9. A positively charged particle located in an atom's nucleus.
  3. 10. Table A table of elements, arranged by atomic number.
  4. 11. An element that tends to be shiny, easily shaped, and a good conductor of electricity or heat.
  5. 13. A negatively charged particle located outside an atom’s nucleus.
  6. 15. number The number of protons in the nucleus of an atom.
Down
  1. 1. The length of time it takes for half of the atoms in a sample of a radioactive element to decay into atoms of another element.
  2. 2. An element that is not metal and has properties generally opposite to those of metal.
  3. 3. a vertical column in the periodic table of the elements
  4. 4. An atom of one element that has a different number of neutrons than another element of the same element.
  5. 6. An atom or group of atoms that has a positive or negative electric charge.
  6. 7. mass number The total number of protons and neutrons in an atom’s nucleus.
  7. 8. a certain type of bond in which nuclei float in the sea of electrons
  8. 12. a horizontal row in the periodic table of the elements
  9. 14. A particle that has no electric charge and is located in an atom’s nucleus.