-
they began creating experiments and activities with Aristotle's idea about matter. They created a scientific process that was used to discover it.
(https://healthresearchfunding.org/alchemists-atomic-theory-explained/)
(https://www.timetoast.com/timelines/atomic-model-timeline-59589314-06f6-410b-a0c5-8d23f60dfa4d) -
theorizes that solid forms of matter are composed of indivisible elements shaped like triangles
(https://www.thecollector.com/ancient-greeks-discover-atoms-atomism/) -
Believed atoms were uniform, solid, hard, incompressible, and indestructible. As well as that they moved in infinite numbers through empty space until stopped.
(https://www.britannica.com/science/atom/Development-of-atomic-theory) -
He believed that everything is composed of very tiny particles, atomism
(https://study.com/learn/lesson/robert-boyle-discovery-inventions.html#:~:text=He%20believed%20that%20everything%20was,and%20behavior%20of%20these%20corpuscles.) -
Defined that matter was composed of atoms that were not created or destroyed during chemical reactions.
(https://study.com/learn/lesson/antoine-lavoisier-atomic-theory-model.html#:~:text=a%20chemical%20change.-,Antoine%20Lavoisier%20and%20Atomic%20Theory,or%20destroyed%20during%20chemical%20reactions.) -
An atom model proposed by John Dalton
(https://homework.study.com/explanation/what-is-the-billiard-ball-model.html) -
He made a theory that says all matter is made of atoms, which are invisible, all atoms of a given element are identical in mass and properties, and compounds are combinations of 2 or more different types of elements.
(https://www.khanacademy.org/science/chemistry/electronic-structure-of-atoms/history-of-atomic-structure/a/daltons-atomic-theory-version-2#:~:text=The%20first%20part%20of%20his,more%20different%20types%20of%20atoms.) -
that equals volumes of gases at the temperature and pressure contain the same number of molecules regardless of their chemical nature and physical properties
(https://www.uky.edu/~garose/avogadro#:~:text=avogadro&text=A%20principle%20stated%20in%201811,is%206.023%20X%201023.) -
elements arranged according to the value of their atomic weight present a clear periodicity of properties
(https://www.britannica.com/biography/Dmitri-Mendeleev) -
She suggested that the powerful rays, or energy, the polonium and radium gave off were actually particles from tiny atoms that were disintegrating inside the elements.
(https://www.khanacademy.org/humanities/big-history-project/stars-and-elements/knowing-stars-elements/a/marie-curie#:~:text=She%20suggested%20that%20the%20powerful,atoms%20were%20solid%20and%20unchanging.) -
He mathematically proved the existence of atoms.
(https://www.ans.org/news/article-969/albert-einstein-and-the-most-elemental-atomic-theory/#:~:text=Einstein%20also%20in%201905%20mathematically,use%20of%20statistics%20and%20probability.&text=Atomic%20theory%20says%20that%20any,always%20in%20random%2C%20ceaseless%20motion.) -
His work demonstrated that electrons did have a discrete quantifiable charge
(https://study.com/learn/lesson/robert-millikan-biography-atomic-theory.html#:~:text=Robert%20Millikan%20Atomic%20Theory,-Robert%20Millikan's%20work&text=Millikan's%20work%20demonstrated%20that%20electrons,electron%20could%20also%20be%20calculated.) -
He described the atom as having a tiny, dense, and positively charged core called the nucleus.
(https://www.primaryconnections.org.au/themes/custom/connections/assets/SBR/data/Chem/sub/atom2/atom2.htm#:~:text=In%201911%2C%20Rutherford%20described%20the,planets%20revolving%20around%20the%20Sun.) -
the square root of the frequency of the X-ray emitted by an atom is proportional to its atomic number.
(https://study.com/academy/lesson/henry-moseley-biography-atomic-theory.html#:~:text=Moseley%20formulated%20his%20law%2C%20Moseley's,proportional%20to%20its%20atomic%20number.) -
describes atoms as consisting of a nucleus with a number of electrons in orbits around that nucleus
(https://www.school-for-champions.com/science/atoms_solar_systems.htm#:~:text=The%20Bohr%20model%E2%80%94or%20solar,are%20like%20tiny%20solar%20systems.) -
Made the Bohr Model, which had a set number of allowed values of electrons.
(https://www.britannica.com/science/Bohr-model) -
A wave-like behavior of an electrons in an atom
(https://en.wikipedia.org/wiki/Atomic_orbital) -
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He discovered that all atoms contain tiny negatively charged subatomic particles or electrons
(https://www.khanacademy.org/science/chemistry/electronic-structure-of-atoms/history-of-atomic-structure/a/discovery-of-the-electron-and-nucleus#:~:text=J.J.-,Thomson's%20experiments%20with%20cathode%20ray%20tubes%20showed%20that%20all%20atoms,positively%2Dcharged%20%22soup.%22)
