Kalium

19
K
Kumpulan
1
Kala
4
Blok
s
Proton
Elektron
Neutron
19
19
20
Ciri-Ciri Am
Nombor atom
19
Berat atom
39.0983
Nombor jisim
39
Kategori
Logam alkali
Warna
Perak
Radioaktif
Tidak
From the English word, potash - pot ashes; Latin kalium, Arab qali, alkali
Struktur hablur
Pusat Badan Kubik
Sejarah
Potassium's symbol K comes from 'kalium' the name of the element in Germany and Scandinavia.

Potassium metal was first isolated in 1807 by Sir Humphry Davy, who derived it from caustic potash by the use of electrolysis of the molten salt with the newly discovered voltaic pile.

Potassium was the first metal that was isolated by electrolysis.
Bilangan elektron per petala
2, 8, 8, 1
Konfigurasi elektron
[Ar] 4s1
K
People whose diets are low in potassium can suffer from hypokalemia
Ciri-Ciri Fizikal
Fasa
Pepejal
Ketumpatan
0.862 g/cm3
Takat lebur
336.53 K | 63.38 °C | 146.08 °F
Takat didih
1032.15 K | 759 °C | 1398.2 °F
Haba pelakuran
2.33 kJ/mol
Haba pengewapan
76.9 kJ/mol
Muatan haba molar
0.757 J/g·K
Banyak pada kerak bumi
1.5%
Banyak pada alam semesta
0.0003%
Potassium
Kredit imej: Images-of-elements
Potassium pearls under paraffin oil
Nombor CAS
7440-09-7
PubChem CID Number
5462222
Ciri-Ciri Atom
Jejari atom
227 pm
Jejari kovalen
203 pm
Keelektronegatifan
0.82 (Skala Pauling)
Kebolehan mengion
4.3407 eV
Isipadu atom
45.46 cm3/mol
Daya pengaliran terma
1.024 W/cm·K
Keadaan pengoksidaan
-1, 1
Aplikasi
The greatest demand for potash has been in its use for fertilizers.

Potassium is an essential constituent for plant growth and is found in most soils.

Potassium nitrate is the main explosive ingredient in gunpowder.

Potassium hydroxide is used in the manufacture of soft soaps and as an electrolyte in alkaline batteries.
Potassium must be handled with great care with full skin and eye protection
Isotop
Isotop stabil
39K, 41K
Isotop tidak stabil
32K, 33K, 34K, 35K, 36K, 37K, 38K, 40K, 42K, 43K, 44K, 45K, 46K, 47K, 48K, 49K, 50K, 51K, 52K, 53K, 54K, 55K