Isotopes
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Isotopes PowerPoint PPT Presentation


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Isotopes. Atoms with the same number of protons but different numbers of neutrons Ex) Carbon 12 vs. Carbon 14 These atoms have a different mass Chemically alike because still have the same number of protons. Isotopes of Hydrogen. Hydrogen -1 simply called hydrogen

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Isotopes

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Isotopes

Isotopes

  • Atoms with the same number of protons but different numbers of neutrons

  • Ex) Carbon 12 vs. Carbon 14

  • These atoms have a different mass

  • Chemically alike because still have the same number of protons


Isotopes of hydrogen

Isotopes of Hydrogen

  • Hydrogen -1 simply called hydrogen

  • Hydrogen - 2 called deuterium

  • Hydrogen - 3 called tritium


Development of amus

Development of AMUs

  • Atomic Mass Units (AMUs)

  • Protons have a mass of 1 amu

  • Neutrona have a mass of 1 amu

  • Electrons have a mass of 0 amu


Atomic mass

Atomic Mass

  • The weighted average mass of the isotopes in a naturally occurring sample of the element

  • Don’t confuse with “mass number”

  • To calculate atomic mass you need 3 pieces of information

  • 1. The number of stable isotopes

  • 2.The mass of each isotope

  • 3.The natural percent abundance of each isotope


Atomic mass1

Atomic Mass

  • Example Problem - Calculate the atomic mass for element X. One isotope has a mass of 10 amus (10X) and is 20% abundant. The other has a mass number of 11 amus (11X) and an abundance of 80%.

  • To solve: Multiply the mass number times the abundance than add them together.


Atomic mass2

Atomic Mass

  • 10 x 0.20 = 2.0

  • 11 x 0.80 = 8.8

  • Add 2.0 + 8.8 = 10.8

    • The atomic mass of element X is 10.8 amus


Atomic mass3

Atomic Mass

  • Your turn. Solve:

    • What is the atomic mass of Element Z? The isotopes are 16Z, 17Z, 18Z; with percent abundances of 99.759, 0.037, 0.204.


Atomic mass4

Atomic Mass

  • Answer

    • 16 x 0.99759 = 15.961

    • 17 x 0.00037 = 0.0063

    • 18 x 0.00204 = 0.0367

  • 15.961 + 0.0063 + 0.0367 = 16.004

  • Tha atomic mass of element Z is 16.004 amus


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