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