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Valence Electron The valence electrons in an atom play a role in the formation of chemical bond.

Valence Electron The valence electrons in an atom play a role in the formation of chemical bond. In the principal group element, their valence electrons occupy the ns and np subshell. In the transition group elements, their valence electrons occupy the (n-1)d and ns subshell. Example

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Valence Electron The valence electrons in an atom play a role in the formation of chemical bond.

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  1. Valence Electron The valence electrons in an atom play a role in the formation of chemical bond. In the principal group element, their valence electrons occupy the ns and np subshell. In the transition group elements, their valence electrons occupy the (n-1)d and ns subshell. DETERMINE PERIOD ANF GROUP By farid SMA N 1 YK 2008

  2. Example 10Ne = 1s2 2s2 2p6 elektron valensi = 8 yaitu dari orbital 2s dan 2p 25Mn = 1s2 2s2 2p6 3s2 3p6 4s2 3d5 elektron valensi = 8 yaitu dari orbital 4s2 dan 5d5 DETERMINE PERIOD ANF GROUP By farid SMA N 1 YK 2008

  3. Determine period and group of element Penentuan golongan dan periode suatu unsure sebagai berikut, a. Membuat konfigurasi elektronnya b. Menentukan electron valensinya (untuk menentukan golongan) c. Menentukan nomor kulit terluarnya atau jumlah kulit atom menunjukkan periode. Untuk Golongan Utama (golongan A) Orbital valensi : s dan p Golongannya ditentukan dari jumlah elektron dalam orbital valensi atau jumlah elektron di kulit terluar. nSx npy Nomor golongan : x + y Golongan IA  nS1 Golongan IIIA  nS2 np1 Golongan IIA  nS2 Golongan IVA  nS2 np2 dan seterusnya DETERMINE PERIOD ANF GROUP By farid SMA N 1 YK 2008

  4. Untuk Golongan Transisi (golongan B) Orbital valensi : ns dan (n-1)d Golongannya ditentukan dari jumlah elektron dalam orbital valensi tersebut. Nomor golongan : x + y nSx (n-1)dy Golongan IIIB nS2 (n-1)d1 Golongan VIIIB nS2 (n-1)d6 Golongan IVB nS2 (n-1)d2 Golongan IXB nS2 (n-1)d7 Golongan VB nS2 (n-1)d3 Golongan XB nS2 (n-1)d8 Golongan VIB nS1 (n-1)d5 Golongan VIB nS1 (n-1)d10 Golongan VIIB nS2 (n-1)d5 Golongan XIIB nS2 (n-1)d10 DETERMINE PERIOD ANF GROUP By farid SMA N 1 YK 2008

  5. DETERMINE PERIOD ANF GROUP By farid SMA N 1 YK 2008

  6. 1. Unsur berikut yang terletak pada golongan VA perioda 3 adalah: 2. Unsur berikut terletak pada golongan VA perioda 3 • berasal dari unsur X yang terletak pada • golongan IVA perioda 2 • golongan IVA perioda 3 • golongan VIA perioda 2 • golongan VIA perioda 3 • golongan VIIA perioda 3 3. Ion DETERMINE PERIOD ANF GROUP By farid SMA N 1 YK 2008

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