# data[].attributes.headline
Schrodinger's Quantum mechanical Model(1926) 

# data[].attributes.subject
Schrodinger's Quantum mechanical Model(1926) 

# data[].attributes.body
Erwin Schrodinger, a Austrian Physicist, took Bohr's Model and used mathematical equations to calculate the likelihood of the positions of electrons. These mathematical equations ended up with his model as instead of the other models that show the direct path of the electrons it shows the possible locations of the electrons.
http://www.abcte.org/files/previews/chemistry/s1_p6.html#:~:text=In%201926%20Erwin%20Schr%C3%B6dinger%2C%20an,mechanical%20model%20of%20the%20atom.

# data[].attributes.body
Niels Bohr was a Danish scientist who expanded of Rutherford's model and added and applied concepts from other scientists and came up with the planetary model. This model, similar to Rutherford's had the nucleus in the middle, however in Bohr's model his showed that there were orbits that had a respective energy level(smallest orbit has least energy).
https://www.nobelprize.org/prizes/physics/1922/bohr/facts/

# data[].attributes.body
Ernest Rutherford, an scientist that did many of the pioneering experiments, went to test Thompson's Plum pudding model by shooting a beam of alpha particles at a thin foil. The experiment went through and to Rutherford's surprise the results were far off from what he anticipated and therefore Thompson's model was wrong. After the experiment Rutherford came up with the idea of the nuclear atom which was the idea that in the middle of the atom there was a dense center of positive charge with electrons around it.

# data[].attributes.body
"He reasoned that since electrons could be produced from electrodes made of various types of metals, all atoms must contain electrons. Since atoms were known to be electrically neutral, Thomson further assumed that atoms
also must contain some positive charge." (Chem Textbook Page 71) From these assumptions Thomson ended making what is know to be the Plum Pudding model which represented an atom as electrons floating in side a ball of positive charge.

# data[].attributes.body
In 1808 John Dalton had published a book that stated his theory of atoms that consisted of 4 main parts:
1.Elements are made out of smaller particles called atoms
2. All atoms of the same element are identical; different elements have different types of atom.
3.Atoms can neither be created nor destroyed(conservation of mass).
4.Chemical reactions reorganize atoms and change the way they are bonded together however atoms themselves are not changed.
(pg.69 of the textbook)

# data[].attributes.body
In 1896, Henry Becquerel, a French scientist accidentally found a mineral with uranium in it and found that it produced its image on a photographic plate in the absence of light. He concluded that this was caused by emission of radiation that he called radioactivity and in studies later on found that there were three types of radioactive emissions: Gamma, alpha, and beta. (pg. 70 of the textbook)

# data[].attributes.headline
Joseph Gay-Lussac and Amadeo Avogadro (1811)

# data[].attributes.subject
Joseph Gay-Lussac and Amadeo Avogadro (1811)

# data[].attributes.body
Gay-Lussac found that 2 volumes of hydrogen
react with 1 volume of oxygen to form 2 volumes of gaseous water and that 1 volume of hydrogen reacts with 1 volume of chlorine to form 2 volumes of hydrogen chloride. (textbook page 69)

Avogadro interpreted these results by proposing that at the same temperature and pressure, equal volumes of different gases contain the same number of particles. (textbook page 69)

# data[].attributes.body
Around 400 B.C. the Greeks  had proposed the idea that all matter was made from the four elements which were fire, earth, water and air. (pg.64 of the textbook)