https://padlet.com/495221/vaji5ygebs8b en-us 2016-11-01 15:05:27 UTC 2016-11-02 15:20:13 UTC hello@padlet.com 495221 https://padlet.com/495221/vaji5ygebs8b/wish/134510639 This is what an atom looks like now, but scientists did not always see it this way. ]]> 2016-11-01 15:16:38 UTC https://padlet.com/495221/vaji5ygebs8b/wish/134510639 495221 https://padlet.com/495221/vaji5ygebs8b/wish/134511600 In 460 BC a philosopher  named Democritus posed the question: If you break a piece of matter in half, and then break it in half again, how many breaks will you have to make before you can break it no further?]]> 2016-11-01 15:18:46 UTC https://padlet.com/495221/vaji5ygebs8b/wish/134511600 495221 https://padlet.com/495221/vaji5ygebs8b/wish/134514884 Sadly the question introduced by Democritus was left unchallenged by other philosophers because of a negative review given by Aristotle who believed Democritus' look was worthless. ]]> 2016-11-01 15:24:48 UTC https://padlet.com/495221/vaji5ygebs8b/wish/134514884 495221 https://padlet.com/495221/vaji5ygebs8b/wish/134516601 It was not until 2000 years passed in the early 1800s did people begin to question the boundaries of matter again. In 1803 a scientist named John Dalton tested various chemicals that consisted an amount of ´bumpy particles' (atoms) Although he did not know the fundamentals he knew that there was something to be further studied. Which he did and then later made the statement that, "elements consisted of atoms that were identical and had the same mass and that compounds were atoms from different elements combined together."]]> 2016-11-01 15:28:41 UTC https://padlet.com/495221/vaji5ygebs8b/wish/134516601 495221 https://padlet.com/495221/vaji5ygebs8b/wish/134797548 In 1869 a man named Dmitiri Mendeleev created the Periodic Table of Elements. Although this is not all the elements, it was a large break through in the scientific community. ]]> 2016-11-02 14:46:02 UTC https://padlet.com/495221/vaji5ygebs8b/wish/134797548 495221 https://padlet.com/495221/vaji5ygebs8b/wish/134802875 In 1903 another new breakthrough to the atomic structure was Hantaro Nagaoka who proposed an atomic model called the Saturnian Model to describe the structure of an atom.]]> 2016-11-02 14:58:32 UTC https://padlet.com/495221/vaji5ygebs8b/wish/134802875 495221 https://padlet.com/495221/vaji5ygebs8b/wish/134805968 In 194 H.G.J Moseley discovered that the number of protons in an element determines its atomic number. 

]]> 2016-11-02 15:05:07 UTC https://padlet.com/495221/vaji5ygebs8b/wish/134805968 495221 https://padlet.com/495221/vaji5ygebs8b/wish/134807845 In 1922  Niels  Bohr proposed an atomic structure theory that stated the outer orbit of an atom could hold more electrons than the inner orbit.

]]> 2016-11-02 15:08:56 UTC https://padlet.com/495221/vaji5ygebs8b/wish/134807845 495221 https://padlet.com/495221/vaji5ygebs8b/wish/134809067 In 1932 a man by the name James Chadwick discovered neutrons, particles whose mass was close to that of a proton.]]> 2016-11-02 15:11:46 UTC https://padlet.com/495221/vaji5ygebs8b/wish/134809067 495221 https://padlet.com/495221/vaji5ygebs8b/wish/134810051 The final stage of an atom structure was created by Ernest Rutherford with this model]]> 2016-11-02 15:14:01 UTC https://padlet.com/495221/vaji5ygebs8b/wish/134810051