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Technology has played a huge part in discovering the atom. One of the many inventions that helped with discovering the atom is a cathode ray tube had help to the discovery of electrons and that helped with the discovery of the atomic nucleus. With out technology we would know what we know today about atoms.
By: Melissa
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The modern Atomic Model explains everything we know today about atoms. The model is alot more knowledgeable because of the more modern technology that has been invented and the use of past knowledge to enhance the models.
Present day
Quark- Subatomic particles carrying a fraction of electrical charge.
The Atomic Model changed because the past models couldn't explain the observations of the other scientists. This initiated scientists to create a new model. Today's Atomic Model is was more complex than Bohr's model becasue it's based on mathematics and the way waves interact.
Neils Bohr discovered that electrons can only orbit the nucleus in certain orbits and that the higher the energy level of a electron the further away it is from the nucleus. He also explained why electrons didn't collapse into the protons, since they are attached to each other. The model was correct with the nucleus in the center and how the electrons orbit the nucleus but it still didnt have a concept of neutrons or protons.
In 1803 the first Atomic Model, the "Billiard Ball", was developed by John Dalton.
The Billiard Ball
is just a circle, no
other understanding
of what is in the atom.
John Dalton also discovered matter cannot be created or destroyed, atoms of different elements can "hook together" and he also created "Dalton's Atomic Theory". Though the model only shows that the atom is circular, the model has no understanding of what was in it.
In 1913 an Atomic Model, the "Ruthford Model", was developed by Neil Bohr.
The "Ruthford Model" shows that the electrons can only orbit on certain orbits depending on the energy level of the electrons and there's only a certain number of electrons aloud to be on each orbit.
1904
1913
The Plum Pudding Model is a "soup of positive charge" with negative electrons floating in it.
In 1904 an Atomic Model, the "Plum Pudding Model", was developed by J.J. Thomson.
In 1911 an Atomic Model, the "Planetary Model", was developed by Ernest Ruthford.
J.J Thomson had discovered that atoms were not the smallest particle, electrons were. Thomson received a Noble Prize for this but his model still had no understanding of how the parts of the atom were arranged. The atom is not just a ball of energy with negative electrons, but the protons are positive and they are inside of the nucleus and the electrons are still negatively charged though.
1911
The Planetary Model is a modified version of Thomson's model, but the electrons are orbiting the nucleus, like the plants to the sun.
Ernest Ruthford found that the atom is a positively charged core with negatively charged electrons. it looked like a "mini solar systems" with the sun being the nucleus and planets being the electrons. Most of the atom is empty and the nucleus carries almost all mass. Ruthford's model is correct with the nucleus is positive, in the center and the electrons, are negative and orbiting the nucleus but is incorrect because the electrons orbit the nucleus in a certain orbit and the model still didn't inclued protons and neutrons.