Lecture 2 (chapter 3)

Lecture 2 (chapter 3) - Chapter3 Elements,Compounds...

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Chapter 3:  Elements, Compounds, and the Periodic Table Chemistry: The Molecular Nature  of Matter, 6E Jespersen/Brady/Hyslop
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Jespersen/Brady/Hyslop Chemistry: The Molecular Nature of Matter, 6E 2 Properties of Subatomic Particles Particle Mass (g) Electrical  Charge Symbol Electron 9.10939 × 10 - 28 - 1 Proton 1.67264 × 10 - 24 +1 Neutron 1.67495 × 10 - 24 0 e 0 1 - p 1 1 1 1   , H n 1 0 3 Kinds of subatomic  particles of principal  interest to Chemists Nucleus  (protons +  neutrons)  Electrons
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Jespersen/Brady/Hyslop Chemistry: The Molecular Nature of Matter, 6E Atomic Notation Atomic number  ( Z Number of protons that atom has in nucleus Unique to each type of element  Element is substance whose atoms all contain  identical number of protons Z   = # protons Isotopes Atoms of same element with different masses Same number of protons (    ) Different number of neutrons (    ) 3 p 1 1 n 0 1
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Jespersen/Brady/Hyslop Chemistry: The Molecular Nature of Matter, 6E Atomic Notation Isotope Mass number  ( A ) A = (# protons) + (#    neutrons) A = Z + N must be equal Atomic Symbols Summarize information about subatomic particles Every isotope defined by 2 numbers  A Symbolized by       Ex.    What is the atomic symbol for helium?  He has 2 e +    Z = 2, A = 4     4 X A Z He 4 2
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Jespersen/Brady/Hyslop Chemistry: The Molecular Nature of Matter, 6E Isotopes Most elements are mixtures of 2 or more stable  isotopes Each isotope has slightly different mass Chemically, isotopes have virtually identical  chemical properties Relative proportions of different isotopes are  essentially constant Isotopes distinguished by  mass number  ( A ) :   Ex.  3 isotopes of hydrogen ( H ) 4 isotopes of iron ( Fe ) 5
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Jespersen/Brady/Hyslop Chemistry: The Molecular Nature of Matter, 6E Example: hat is the isotopic symbol for Uranium- 235? Number of protons ( p + ) = 92   = number of electrons in neutral atom Number of neutrons ( 1 n ) = 143 Atomic number ( Z ) = 92 Mass number ( A ) = 92 + 143 = 235 Chemical symbol =  U ummary for uranium-235: 6 U 235 92
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Jespersen/Brady/Hyslop Chemistry: The Molecular Nature of Matter, 6E 7 Learning Check: Fill in the blanks: symbol neutrons protons  electrons 60 Co       81 Br                             36       29    29 33 27 27 46 35 35 Cu 65 29
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Jespersen/Brady/Hyslop Chemistry: The Molecular Nature of Matter, 6E Your Turn! An atom of           has  ___ protons, ___ 
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This note was uploaded on 09/19/2011 for the course CHE 1110 taught by Professor Hansen during the Fall '11 term at St. Johns Duplicate.

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Lecture 2 (chapter 3) - Chapter3 Elements,Compounds...

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