Unit 2 Review by, Liz M.

Red Shift- This is when galaxies and stars move away from us and each other. This was discovered by Edwin Hubble.

Cosmic microwave background- The oldest light in our universe. It was imprinted when the universe was just 380,000 years old.

Once the Universe expanded and cooled down, these elements were created such as; hydrogen, helium and oxygen.

Galactic Universe- Because of the big bang theory, our Universe started expanding although we can not see much difference because it grows slowly.

Models of the atoms
  • Dalton's Postulates;
  • All matter consists of indivisible particles called atoms
  • Atoms cannot be made or destroyed.
  • All atoms of an element are identical, and different from those of other elements.
  • Atoms of elements combine in the ratio of whole numbers to produce a large number of compound-atoms of a new substance.
Thomson made a model of an atom which is known as the "Plum Pudding Model". He also made the discovery of electrons and protons by the help of his other model, "Cathodes Ray". This made him realize that atoms are not indivisible and can still be broken into smaller particles.
Rutherford came up with a way to show that an atom was just empty space and it seemed to have a very small positive charge in the center. He managed to show this with his gold foil experiment.

Bohr atomic model was found by Rutherford and this atom has a positively charged nucleus surrounded by electrons that travel in circular orbits around the nucleus


Created with images by new 1lluminati - "space s(m)urf" • rmforall@gmail.com - "#91 astrodeep200407aab10aa.png 4.12 MB 1244X1243 HUDF top center NASA original" • NASAblueshift - "The CMB Cold Spot" • Hugo-90 - "Hydrogen Powered Mustang" • newena - "balloons celebration celebrate" • fdecomite - "Oxygen" • allispossible.org.uk - "DNA Molecule display, Oxford University" • Micah Sittig - "Magnet on electrons" • tonynetone - "Ernest Rutherford"

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