Barium

56
Ba
Golongan
2
Periode
6
Blok
s
Proton
Elektron
Neutron
56
56
81
Sifat Umum
Nomor atom
56
Massa atom
137,327
Nomor massa
137
Kategori
Logam alkali tanah
Warna
Perak
Radioaktif
Tidak
From the Greek word barys, heavy
Struktur kristal
Kubik Berpusat-badan
Sejarah
Barium was identified as a new element in 1774 by Carl Wilhelm Scheele.

Barium was first isolated by electrolysis of molten barium salts in 1808, by Sir Humphry Davy in England.

Robert Bunsen and Augustus Matthiessen obtained pure barium by electrolysis of a molten mixture of barium chloride and ammonium chloride.
Elektron per kulit
2, 8, 18, 18, 8, 2
Konfigurasi elektron
[Xe] 6s2
Ba
At low doses, barium acts as a muscle stimulant
Sifat Fisika
Fase
Solid
Kepadatan
3,594 g/cm3
Titik lebur
1000,15 K | 727 °C | 1340,6 °F
Titik didih
2170,15 K | 1897 °C | 3446,6 °F
Kalor peleburan
8 kJ/mol
Kalor penguapan
140 kJ/mol
Kapasitas kalor molar
0,204 J/g·K
Kelimpahan di kerak bumi
0,034%
Kelimpahan di alam semesta
1×10-6%
Barium
Kredit Gambar: Images-of-elements
Barium with a grey oxide layer under argon
Nomor CAS
7440-39-3
PubChem CID Number
5355457
Sifat Atom
Jari-jari atom
222 pm
Jari-jari kovalen
215 pm
Elektronegativitas
0,89 (Skala Pauling)
Potensi Ionisasi
5,2117 eV
Volume atom
39,24 cm3/mol
Kondusivitas termal
0,184 W/cm·K
Bilangan oksidasi
2
Aplikasi
Barium is used as a flashed getter in vacuum tubes to remove the last traces of gases.

It is often used in barium-nickel alloys for spark plug wire.

Barium sulfate is important to the petroleum industry as a drilling fluid in oil and gas wells.

Barium is also used in medicine to detect abnormalities in the digestive system.
Water-soluble barium compounds are poisonous
Isotop
Isotop stabil
130Ba, 132Ba, 134Ba, 135Ba, 136Ba, 137Ba, 138Ba
Isotop tidak stabil
114Ba, 115Ba, 116Ba, 117Ba, 118Ba, 119Ba, 120Ba, 121Ba, 122Ba, 123Ba, 124Ba, 125Ba, 126Ba, 127Ba, 128Ba, 129Ba, 131Ba, 133Ba, 139Ba, 140Ba, 141Ba, 142Ba, 143Ba, 144Ba, 145Ba, 146Ba, 147Ba, 148Ba, 149Ba, 150Ba, 151Ba, 152Ba, 153Ba