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    Lesson 2 Formation of Heavy Elements

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    lily smith
    This document discusses stellar nucleosynthesis and the formation of heavy elements in stars. It begins by explaining that light elements like hydrogen and helium were formed in the Big Bang. Heavier elements are then formed through nuclear fusion in stars through different processes. The main stages of a star's life cycle are described, and it is explained that elements are formed at different stages - for example, the carbon-nitrogen-oxygen cycle in later stages of more massive stars. Neutron capture processes also contribute to forming heavier elements as stars evolve through their life cycles.

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    Lesson 2 Formation of Heavy Elements

    Uploaded by

    lily smith
    31 views21 pages
    This document discusses stellar nucleosynthesis and the formation of heavy elements in stars. It begins by explaining that light elements like hydrogen and helium were formed in the Big Bang. Heavier elements are then formed through nuclear fusion in stars through different processes. The main stages of a star's life cycle are described, and it is explained that elements are formed at different stages - for example, the carbon-nitrogen-oxygen cycle in later stages of more massive stars. Neutron capture processes also contribute to forming heavier elements as stars evolve through their life cycles.

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    This document discusses stellar nucleosynthesis and the formation of heavy elements in stars. It begins by explaining that light elements like hydrogen and helium were formed in the Big Bang. Heavier elements are then formed through nuclear fusion in stars through different processes. The main stages of a star's life cycle are described, and it is explained that elements are formed at different stages - for example, the carbon-nitrogen-oxygen cycle in later stages of more massive stars. Neutron capture processes also contribute to forming heavier elements as stars evolve through their life cycles.

    Copyright:

    © All Rights Reserved
    Download as PPTX, PDF, TXT or read online from Scribd
    Download as pptx, pdf, or txt
    31 views21 pages

    Lesson 2 Formation of Heavy Elements

    Uploaded by

    lily smith
    This document discusses stellar nucleosynthesis and the formation of heavy elements in stars. It begins by explaining that light elements like hydrogen and helium were formed in the Big Bang. Heavier elements are then formed through nuclear fusion in stars through different processes. The main stages of a star's life cycle are described, and it is explained that elements are formed at different stages - for example, the carbon-nitrogen-oxygen cycle in later stages of more massive stars. Neutron capture processes also contribute to forming heavier elements as stars evolve through their life cycles.

    Copyright:

    © All Rights Reserved
    Download as PPTX, PDF, TXT or read online from Scribd
    Download as pptx, pdf, or txt
    of 21

    2nd Semester (3rd Quarter)

    FORMATION OF
    HEAVY ELEMENTS
    PHYSICAL SCIENCE
    MODULE 1
    After going through this module, you are
    expected to:
    1.Explain stellar nucleosynthesis;
    2.Describe the different stages of life cycle of a stars;
    3.Cite the different heavy elements formed in each
    stages of star cycle.
    4.Describe how heavier elements formed during
    stellar nucleosynthesis and evolution.
    2nd Semester (3rd Quarter)
    STELLAR
    NUCLEOSYNTHESIS:
    RISE OF THE STARS

    • Scientist believe that the


    formation of the universe
    began through the
    explosion of primordial
    atom which happened 13
    billion years ago. It is
    known as the BIG BANG. It
    became a theory that also
    explains the continuous
    expansion of the universe.
    2nd Semester (3rd Quarter)
    STELLAR
    NUCLEOSYNTHESIS:
    RISE OF THE STARS

    • Right after Big Bang, protons


    and neutrons combined
    together and formed light
    elements hydrogen and
    helium in the process of Big
    Bang nucleosynthesis. Other
    light elements such as lithium
    and berryllium were also
    formed during this process.

    2nd Semester (3rd Quarter)


    STELLAR
    NUCLEOSYNTHESIS

    • “Stellar means star and


    the formation of elements
    in the center of the star is
    called stellar
    nucleosynthesis.
    • Carl Sagan said that “We
    are made of star stuff”

    2nd Semester (3rd Quarter)


    STAR LIFE
    CYCLE Nebula

    Proto
    star

    Main Sequence Star

    Red giant Red Super Giant

    White dwarf Super Nova

    Black dwarf
    Neutron star Black hole
    2nd Semester (3rd Quarter)
    PROTON-
    PROTON CHAIN
    REACTION
    ALSO KNOWN
    AS BIG BANG
    NUCLEOSYNTHE
    SIS

    2nd Semester (3rd Quarter)


    FORMATION OF
    DEUTERIUM

    2nd Semester (3rd Quarter)


    FORMATION OF HELIUM-3

    2nd Semester (3rd Quarter)


    FORMATION OF
    TRITIUM OR
    HYDROGEN-3
    • Tritium or hydrogen-
    3 was produced from
    the fusion of two
    deuterium nuclei and
    a release of a proton.

    2nd Semester (3rd Quarter)


    FORMATION OF HELIUM-4

    • Helium-4 was
    also
    synthesized
    from
    deuterium and
    helium-3.

    2nd Semester (3rd Quarter)


    FORMATION OF HELIUM-4

    • Helium-
    4 was
    produced
    from the
    fusion of
    deuterium
    and tritium.

    2nd Semester (3rd Quarter)


    LITHIUM-7 WAS SYNTHESIZED FROM HELIUM-4 AND
    TRITIUM

    2nd Semester (3rd Quarter)


    BERYLLIUM-7 WAS PRODUCED FROM HELIUM-3 AND
    HELIUM-4 .

    2nd Semester (3rd Quarter)


    • Among the light elements formed,
    deuterium, helium-3, helium-4,
    and lithium-7 were stable.
    Beryllium-7 was unstable and
    decayed spontaneously to
    lithium-7.

    2nd Semester (3rd Quarter)


    CNO CYCLE
    (CARBON-
    NITROGEN-
    OXYGEN
    CYCLE)

    2nd Semester (3rd Quarter)


    CNO CYCLE

    2nd Semester (3rd Quarter)


    TRI ALPHA
    PROCESS
    • Happens in red
    giant stars once
    they leave the
    stage of main
    sequence star.
    • This is how the
    three Helium-4 are
    converted into
    Carbon.
    2nd Semester (3rd Quarter)
    2nd Semester (3rd Quarter)
    Neutron Capture

    - a neutron is added to a seed nucleus


    - neutron capture can be SLow process or Rapid
    process.

    2nd Semester (3rd Quarter)


    2nd Semester (3rd Quarter)

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