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The Atom: Niels Bohr (year ______) Read pp. 112-121 to complete the following notes -Bohrs model has a positive nucleus (containing protons & neutrons) surrounded by electrons. History of the Atom - The electrons move around the nucleus in Democritus (year _____ BCE) ____________ _______ with each path a - called the smallest particle of a substance an _____________ meaning ______ _________ ___ ___ ________. -An _________ is the basic unit of matter because it is the smallest unit that has the chemical ________________ of an ________________. Picture of Bohr’s Atomic Model __________ _____________ from the nucleus. James Chadwick (Year ______) -Discovered that the nucleus contains _________________ particles called _________________ Which is smaller; at atom or the cells in living things? ________________ Current Atomic Theory John Dalton (year 1808) -_________________move within an area around the nucleus called the -Published the ATOMIC THEORY which states: ___________ __________ 1. All ______________ is made up of atoms 2. Atoms cannot be _____________, ______________, or _______________ 3. All atoms of a certain element are ______________. But they are _________________ from atoms of all other __________________. 4. Atoms _________ with other atoms to make _______ substances Draw a picture of Daltons Atomic Model in the box. Parts of the Atom Part of the atom Location IN the atom Electric Charge Relative mass Proton ~1u (slightly less massive than a neutron) Nucleus 1- JJ Thomson (year _______) -Discovered negatively charged subatomic particles -The charges of protons and electrons are ________________ but _________ called _________________ -Atoms have a net, or overall, charge of ________ -His model of an atom was a _________________ sphere with the ______________ mixed through it. -An atom can lose or gain _____________, in which case we refer to the atom as an _______. (They have a net charge that is NOT ____) Draw a picture of Thomson’s Atomic Model in the box Ernest Rutherford (year _______) -Suggested that atoms have a _________________ (which is a small, __________ center that has a __________________ charge and is surrounded by moving ____________. -Later he found that the nucleus contains smaller positively charged subatomic particles called ______________ Draw a picture of Rutherford’s Atomic Model in the box 1 -The number of _________ distinguishes the atoms of one element from another. -The number of protons in the nucleus of an atom is the ____________ _____________ -Isotopes are atoms of the same element that have different numbers of ________________ -The total number of protons and neutrons in an atoms nucleus is its __________ _______________ 2
