Matter, Trends & Bonding

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Across
  1. 5. the distance from the centre of the atom to the outermost orbital.
  2. 9. Arranged the elements according to their atomic mass and valence electrons.
  3. 11. a measure of an atoms ability to attract electrons
  4. 12. Mass of element/mass of compound x100
  5. 14. Each version of a sub shell can't hold more than 2 Electrons
  6. 15. Greek philosopher who proposed that matter was made up of small particles.
Down
  1. 1. Arranged the elements in order of atomic mass.
  2. 2. the amount of energy needed to remove an electron from an atom.
  3. 3. electrons travelled in specific orbital's around the nucleus.
  4. 4. All matter is composed of tiny, indivisible particles called atoms.
  5. 5. An average of the masses of all elements isotopes
  6. 6. An American Physicist determined the exact charge of an electron.
  7. 7. Electrons must exist as pairs.
  8. 8. Will melt at a single temp
  9. 10. a region in which electrons can be found
  10. 13. the energy change that occurs when an atom gains an electron to form a negative ion.