Biology

Democritus

400 BCE

Democritus believed that between the atoms there was an empty space, also that atoms were and always be in movement and that they are indestructible and that there are an infinite number, kinds, shapes and sizes of atoms. So he drew just a circle and that was his way to represent an atom
Info and Photo: MATT WILLIAMS. (December 11, 2015). Who Was Democritus?. august 25, 2018, de universe today Sitio web: https://www.universetoday.com/60058/democritus-atom/

John Dalton

1803

John Dalton said that all matter/things were composed of atoms he was the one to come up with the name Atoms. This was like the theory of Democritus. So his model was just a circle
Info and Photo: anonimous. (2016). Models of the Atom. August 2, 2018, de Siyavula Sitio web: https://www.siyavula.com/read/science/grade-10/the-atom/04-the-atom-02

Joseph John Thomson

1897

Joseph John Thompson he was the one to discover the electrons and to realize that they were negative. Then he came up with the plum pudding model where the pudding was the positive and the raisins were the negative electrons. He did say that the atoms had a nucleus but the didn´t represent it on the model.
Info: ABCTE. (2007). Atomic Structure, Periodicity, and Matter: Development of the Atomic Theory. August 25, 2018, de ABCTE

Ernest Rutherford

1911

Ernest R. model was called a nuclear atom or planetary model of the atom. He was the one to discover the protons and include in his model. He stated that in the center there was the nucleus (neutral) was like the sun. The electrons (negative)and protons (positive) revolved around the atom like the plants in an orbit around the nucleus

Niels Böhr

1913

Niels Böhr stated that in the center of the atom there was a nucleus then there was the electron orbit were the electrons laid there. he said that the atoms were composed of hydrogen and discovered that when the electrons jumped from one electron orbit to another to be closer to the nucleus the atom would lose power.

Erwin Schrödinger

1926

Erwin Schrödinger model was a little cloud were the electrons were floating around and the atom was in the middle. As the site says "model does not define the exact path of an electron, but rather, predicts the odds of the location of the electron."
info and photo: ABCTE. (2007 ). Atomic Structure, Periodicity, and Matter: Development of the Atomic Theory . August 25, 2018, de ABCTE Sitio web: http://www.abcte.org/files/previews/chemistry/s1_p6.html

Werner Heisenberg

1927

Werner Heisenberg said was that this was impossible to measure or "guess" where the electron was going to appear. He invented what we know as the uncertainty principle. Keith Russell. (August 10, 2018).

James Chadwick

1932

Chadwick stated that the nucleus was composed of protons and what was his discovery the protons and that the nucleus was in the center. Around the nucleus there were the orbits and in the orbits there were electrons
Info and photo: ABCTE. (2007). Atomic Structure, Periodicity, and Matter: Development of the Atomic Theory. August 25, 2018, de ABCTE Sitio web: http://www.abcte.org/files/previews/chemistry/s1_p6.html