Download Note-taking Strategy Your notes should contain a title with

Note‐taking Strategy Your notes should contain a title with reference to the text pages. Then list the main ideas in the margin and give supporting details in the main area of the page. Finally, put it all together in YOUR OWN WORDS. You may use my example below, but then you must do your own notes for the rest of the reading. 4.1 Defining the Atom and 5.1 Models of the Atom Pg. 101‐102, 127‐130 Main concept Atom Democritus Dalton Atomic theory Details Smallest particle of an element that retains its identity in a chemical reaction Greek philosopher, 460BC‐370BC Indivisible, indestructible Did not explain chemical behavior No experiments done English chemist, 1766‐1844 Used experiments Elements are made of tiny indivisible particles (atoms) Atoms of an element are identical Atoms of each different element are unique Atoms can mix physically Atoms can combine chemically in whole‐number ratios (compounds) Chemical reaction: atoms rearrange, separate, join, Atoms cannot change identity Summary: The idea of the atom was proposed over 2500 years ago. Democritus taught that the atom was the tiniest particle of matter. He thought of it as a tiny, indivisible, indestructible particle. However, his ideas were not based on any scientific experimenting. 2000 years later in England, John Dalton did a bunch of experiments and came up with a revised atomic theory. He agreed that the atom is the tiniest particle of matter and that they are indivisible. However, he added that all atoms are identical within an element and that they are different from element to element. He mixed them physically, but also chemically combined them to form new compounds. Compounds have whole‐number ratios. Finally, he said that during reactions, atoms retain their identity, but may rearrange, join or separate.