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Unsur golongan 9

Golongan 9 dalam tabel periodik
Hidrogen Helium
Lithium Berilium Boron Karbon Nitrogen Oksigen Fluor Neon
Natrium Magnesium Aluminium Silikon Fosfor Sulfur Clor Argon
Potasium Kalsium Skandium Titanium Vanadium Chromium Mangan Besi Cobalt Nikel Tembaga Seng Gallium Germanium Arsen Selen Bromin Kripton
Rubidium Strontium Yttrium Zirconium Niobium Molybdenum Technetium Ruthenium Rhodium Palladium Silver Cadmium Indium Tin Antimony Tellurium Iodine Xenon
Caesium Barium Lanthanum Cerium Praseodymium Neodymium Promethium Samarium Europium Gadolinium Terbium Dysprosium Holmium Erbium Thulium Ytterbium Lutetium Hafnium Tantalum Tungsten Rhenium Osmium Iridium Platinum Gold Mercury (element) Thallium Lead Bismuth Polonium Astatine Radon
Francium Radium Actinium Thorium Protactinium Uranium Neptunium Plutonium Americium Curium Berkelium Californium Einsteinium Fermium Mendelevium Nobelium Lawrencium Rutherfordium Dubnium Seaborgium Bohrium Hassium Meitnerium Darmstadtium Roentgenium Copernicium Nihonium Flerovium Moscovium Livermorium Tennessine Oganesson
golongan 8  golongan 10
Nomor golongan IUPAC 9
Nama berdasarkan unsur golongan kobalt
Nomor golongan CAS
(AS, pola A-B-A)
VIIIB
Nomor IUPAC lama
(Eropa, pola A-B)
VIII

↓ Periode
4
Image: Cobalt, electrolytic made, 99,9%
Kobalt (Co)
27 Logam transisi
5
Image: Rhodium, powder, pressed, remelted 99,99%
Rodium (Rh)
45 Logam transisi
6
Image: Pieces of pure iridium
Iridium (Ir)
77 Logam transisi
7 Meitnerium (Mt)
109 Sifat kimia tidak diketahui

Keterangan
unsur primordial
unsur sintetis
Warna nomor atom:
hitam=padat

Golongan 9 atau VIIIB adalah golongan unsur kimia di tabel periodik. Golongan ini juga dikenal sebagai golongan kobalt. Golongan ini terdiri dari unsur kobalt (Co), rodium (Rh), iridium (Ir), dan unsur sintetis yang radioaktif meitnerium (Mt).

Karakteristik

Z Unsur Jumlah elektron/kelopak Konfigurasi elektron
27 kobalt 2, 8, 15, 2 [Ar] 3d7 4s2
45 rodium 2, 8, 18, 16, 1 [Kr] 4d8 5s1
77 iridium 2, 8, 18, 32, 15, 2 [Xe] 4f14 5d7 6s2
109 meitnerium 2, 8, 18, 32, 32, 15, 2 * [Rn] 5f14 6d7 7s2 *

* = prediksi

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