Matter, Trends & Bonding

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