Sorry for the late upload. Anyway this is the powerpoint of Dalton's Atomic Theory we shared in class.

1. Dalton’s At mic Theory Group 2 Balicanta, Christopher John Magdaong, Jeremy Jay Perez, Mika Emmanuel Jerrico Pagulayan, Gianne Tan, Mara Lois John Dalton 1766 - 1844

2. A History on the Idea of ATOMS 450 BCE - Democritus, a Greek philosopher, once coined the term “atomos”, meaning “indivisible”, this he refers to the smallest part of matter that is so small that it is impossible to divide it further. Now, it became the modern “Atom”. 1789 - Antoine Lavoisier, a French chemist, discovered the law of conservation of matter, and said that the “element” is the most basic substance and cannot be broken down by methods of chemistry. 1799- Joseph Proust hypothesized the Law of Definite Composition that particles combine at definite proportions to form a compound. I wonder why all Greek philosophers look alike! Lavoisier, the guy who was responsible for THIS SUBJECT

3. Dalton’s Theory After studying these ideas, John Dalton, an English chemist, meteorologist and physicist, arrived at this theory: The ATOM is the smallest particle of matter! An atom cannot be cut into smaller particles! Atoms are neither created nor destroyed! Two or more atoms combined in whole numbers to form compounds! All atoms of the same element are identical! But not of different elements! Dalton doing his impression of Lady Gaga’s Telephone

5. Two Or More Atoms Combine To Form Compounds Dalton theorized from the idea of Proust that all substances are composed of atoms in different proportions. All the atoms of one element, said Dalton, were exactly identical and the atoms of each element were different to the atoms of every other element, the atoms differed from each other only in mass. H atom O atom 2 H atoms and 1 O atom makes water 2 H atoms and 2 O atoms make Hydrogen Peroxide

6. The Law of Conservation of Mass This states that in chemical reactions, atoms are neither created nor destroyed. This means that in chemical reactions, the mass of the reactants must be EQUAL to the mass of the products. X g X g X g

7. Dalton’s model of the atom As Dalton’s postulates have stated, the atom is the smallest particle of matter, so he visualized it as a solid sphere back then, also, he based his theory with more on experimentation than pure reason. So this was his model of the atom, later improved by Thomson, Rutherford and Bohr. But of course we’ll all discuss that in the future. - - - - - - - -