Lantanum

57
La
Kumpulan
Tiada
Kala
6
Blok
f
Proton
Elektron
Neutron
57
57
82
Ciri-Ciri Am
Nombor atom
57
Berat atom
138.90547
Nombor jisim
139
Kategori
Lantanid
Warna
Perak
Radioaktif
Tidak
From the Greek word lanthanein, to lie hidden
Struktur hablur
Hexagonal Ringkas
Sejarah
Lanthanum was discovered in 1839 by Swedish chemist Carl Gustav Mosander.

He partially decomposed a sample of cerium nitrate by heating and treating the resulting salt with dilute nitric acid.

From the resulting solution, he obtained a pale brick colored oxide of the new rare earth.

Lanthanum was isolated in relatively pure form in 1923.
Bilangan elektron per petala
2, 8, 18, 18, 9, 2
Konfigurasi elektron
[Xe] 5d1 6s2
La
Lanthanum is the most reactive of the rare earth metals
Ciri-Ciri Fizikal
Fasa
Pepejal
Ketumpatan
6.145 g/cm3
Takat lebur
1193.15 K | 920 °C | 1688 °F
Takat didih
3737.15 K | 3464 °C | 6267.2 °F
Haba pelakuran
6.2 kJ/mol
Haba pengewapan
400 kJ/mol
Muatan haba molar
0.195 J/g·K
Banyak pada kerak bumi
0.0034%
Banyak pada alam semesta
2×10-7%
Pure
Kredit imej: Images-of-elements
Pure lanthanum
Nombor CAS
7439-91-0
PubChem CID Number
23926
Ciri-Ciri Atom
Jejari atom
187 pm
Jejari kovalen
207 pm
Keelektronegatifan
1.1 (Skala Pauling)
Kebolehan mengion
5.5769 eV
Isipadu atom
22.5 cm3/mol
Daya pengaliran terma
0.135 W/cm·K
Keadaan pengoksidaan
2, 3
Aplikasi
Lanthanum is used in large quantities in batteries for hybrid automobiles.

It is also used to make night vision goggles.

Small amounts of lanthanum, as an additive, can be used to produce nodular cast iron.

Lanthanum carbonate is used to reduce blood levels of phosphate in patients with kidney disease.
Lanthanum and its compounds are considered to be moderately toxic
Isotop
Isotop stabil
139La
Isotop tidak stabil
117La, 118La, 119La, 120La, 121La, 122La, 123La, 124La, 125La, 126La, 127La, 128La, 129La, 130La, 131La, 132La, 133La, 134La, 135La, 136La, 137La, 138La, 140La, 141La, 142La, 143La, 144La, 145La, 146La, 147La, 148La, 149La, 150La, 151La, 152La, 153La, 154La, 155La