The document discusses the history of atomic models from Dalton to modern atomic theory. It explains that early atomic models proposed atoms as solid spheres (Dalton) or mostly empty space (Rutherford), and that later models incorporated quantum mechanics ideas like discrete energy levels (Bohr) and electron orbitals (modern atomic theory). It also describes how electrons can move between orbitals by absorbing or releasing energy and the maximum number of electrons that can occupy each orbital.

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Sistem Periodik Unsur
By: Harum Nurin Setyowening

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Presentation are communication tools that can be
used as lectures, speeches, reports, and more.
Most of the time, they’re presented before an
audience.

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Dalton Thomson Rutherford
Atom adalah bagian
terkecil materi yg tidak
dapat dibagi lagi
Penemuan sub atom
bermuatan negative
menggunakan sinar
katoda
Atom terdiri dari rongga
kosong

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• Atom terdiri dari rongga kosong
• Kelemahan:
Elektron terus memancarkan energi
(ingat konsep gaya coloumb pada
listrik statis) lama kelamaan energi
akan habis dan electron tertarik ke
inti atom

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Planck Bohr
Mekanika
Kuantum
• Menemukan konsep
dualism cahaya (sebagai
partikel sekaligus
gelombang)
• Hukum Planck:
menyatakan energi
minimum agar electron
bisa lepas.
Postulat Bohr:
Elektron mengelilingi inti
pada tingkat energi
tertentu
• Atom modern
• Menentukan orbital,
tk energi, bentuk,
serta orientasi orbital

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• Elektron dapat berpindah orbit
a. Berpindah ke tk energi lebih tinggi
dengan menyerap energi
b. Berpindah ke tk energi lebih rendah
dengan melepas energi
• Jumlah electron yang menempati
orbit tertentu mengikuti pola sbb:
a. Kulit K maksimal 2 electron
b. Kulit L maksimal 8 electron
c. Kulit M maksimal 18 electron
d. Kulit N maksimal 32 electron
• Elektron terluar (electron valensi)
maksimal 8
Kulit K
Kulit L
Kulit M
Kulit N
Energi
makin
besar

8. Harum Nurin S
Presentation are communication tools that
can be used as lectures, speeches, reports,
and more. Most of the time, they’re
presented before an audience.

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Answer
Answer
Answer
Answer
Answer
Answer
Presentation are communication tools that can be used as lectures, speeches, reports,
and more. Most of the time, they’re presented before an audience.

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Presentation are communication
tools that can be used as lectures
Presentation are communication
tools that can be used as lectures
Presentation are communication
tools that can be used as lectures
Presentation are communication
tools that can be used as lectures

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Presentation are
communication tools that can
be used as lectures, speeches,
reports, and more.
Presentation are
communication tools that can
be used as lectures, speeches,
reports, and more.
Presentation are
communication tools that can
be used as lectures, speeches,
reports, and more.

13. Harum Nurin S
Presentation are
communication tools that can
be used as lectures, speeches,
reports, and more.
Presentation are
communication tools that can
be used as lectures, speeches,
reports, and more.
Presentation are
communication tools that can
be used as lectures, speeches,
reports, and more.

14. Harum Nurin S
Presentation are communication tools that can be
used as lectures, speeches, reports, and more.
Presentation are communication tools that can be
used as lectures, speeches, reports, and more.
Presentation are communication tools that can be
used as lectures, speeches, reports, and more.

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