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Structure of the Atom or Lets Get up and Atom Chemical Symbols Nucleus/ clouds Subatomic Particles Atomic Terms

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Chemical Symbols Capitals matter! Element symbols contain ONE capital letter followed by lowercase letter(s) if necessary. Co vs. CO Metal that forms bright blue solid compounds. Poisonous gas.

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Subatomic Particles Most of the atoms mass. Atomic Number equals the # of... in a neutral atom NUCLEUS ELECTRONS PROTONS NEUTRONS NEGATIVE CHARGE POSITIVE CHARGE NEUTRAL CHARGE ATOM

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Subatomic Particles Quarks 6 types 3 quarks = 1 proton or 1 neutron He

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II. Electron Clouds (shells) Contain electrons (-) Orbital Energy Levels Bohr Model Diagrams

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Orbital Region where there is 90% probability of finding an electron. Cant pinpoint the location of an electron. Density of dots represents degree of probability.

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Orbitals have different shapes.

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Energy Levels Electrons can only exist at certain energy levels. Low energy levels are close to the nucleus. Each energy level (n) can hold 2n 2 electrons.

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Bohr Model Diagrams Simplified energy levels using Bohrs idea of circular orbits. e- Maximum e - Level 12e - Level 28e - Level 318e - Level 432e - Lithium Atomic #:3 Mass: 7 # of p:3 # of e:3 # of n:4 p p n n n n p e- Can replace with: 3p 4n

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Bohr Model Activity Choose a number between 1 & 18. Find your element by the atomic number you picked. Draw a Bohr Model diagram for your element on your marker board. Round off the mass listed on the table and subtract the atomic # to find the # of neutrons. Abbreviate the # of p and n in the nucleus. Have a partner check your drawing. Repeat with a new element.

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Atomic terms Atomic Number (Z) Mass Number (A) Atomic Mass unit (amu) Isotopes

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Atomic Number (Z): Number of Protons In a neutral atom the # of protons = number of electrons P+ = e- 14+ = 14-

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Mass Number Total # of nucleons (protons + neutrons) in nucleus of atom. # of P+ (+) # of n- Always a whole number. # of neutrons = A - Z # of neutrons = mass # - atomic # © Addison-Wesley Publishing Company, Inc.

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Atomic Mass atomic mass unit (amu) = unit to describe the mass of an atom u 1 u = 1 / 12 the mass of a 12 C atom 1 u 1 u 1 proton = 1 u 1 neutron = 1 u u 1 u = 1.67 10 -24 g

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© Addison-Wesley Publishing Company, Inc. ParticleSymbolCharge Mass in amu Mass in grams Electron e" 1/1 840 amu 9.11 x 10 -28 g Proton P+P+ +11 amu 1.67 x 10 -24 g Neutron N +- or n 0 01 amu 1.67 x 10 -24 g

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