physical science

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Across
  1. 3. tiny particles that make up protons and neutrons
  2. 5. a vertical column on the periodic table
  3. 6. a variation of an atom
  4. 9. when an atom is apart of a covalent bond how badly does the atom want to hog the electron
  5. 10. the amount of time it takes for half of the radioactive atoms in an object to decay
Down
  1. 1. the energy required to remove an electron and make the atom positive
  2. 2. the number of protons in the nucleus of an atom
  3. 4. the weight of protons plus neutrons in the nucleus
  4. 7. substance with atoms that are all alike
  5. 8. a horizontal row on the periodic table