Barium

56
Ba
Kumpulan
2
Kala
6
Blok
s
Proton
Elektron
Neutron
56
56
81
Ciri-Ciri Am
Nombor atom
56
Berat atom
137.327
Nombor jisim
137
Kategori
Logam alkali bumi
Warna
Perak
Radioaktif
Tidak
From the Greek word barys, heavy
Struktur hablur
Pusat Badan Kubik
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.
Bilangan elektron per petala
2, 8, 18, 18, 8, 2
Konfigurasi elektron
[Xe] 6s2
Ba
At low doses, barium acts as a muscle stimulant
Ciri-Ciri Fizikal
Fasa
Pepejal
Ketumpatan
3.594 g/cm3
Takat lebur
1000.15 K | 727 °C | 1340.6 °F
Takat didih
2170.15 K | 1897 °C | 3446.6 °F
Haba pelakuran
8 kJ/mol
Haba pengewapan
140 kJ/mol
Muatan haba molar
0.204 J/g·K
Banyak pada kerak bumi
0.034%
Banyak pada alam semesta
1×10-6%
Barium
Kredit imej: Images-of-elements
Barium with a grey oxide layer under argon
Nombor CAS
7440-39-3
PubChem CID Number
5355457
Ciri-Ciri Atom
Jejari atom
222 pm
Jejari kovalen
215 pm
Keelektronegatifan
0.89 (Skala Pauling)
Kebolehan mengion
5.2117 eV
Isipadu atom
39.24 cm3/mol
Daya pengaliran terma
0.184 W/cm·K
Keadaan pengoksidaan
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