Mangan

25
Mn
Golongan
7
Periode
4
Blok
d
Proton
Elektron
Neutron
25
25
30
Sifat Umum
Nomor atom
25
Massa atom
54,938045
Nomor massa
55
Kategori
Logam transisi
Warna
Perak
Radioaktif
Tidak
From the Latin word magnes, magnet, from magnetic properties of pyrolusite
Struktur kristal
Kubik Berpusat-badan
Sejarah
By the mid-18th century, Swedish chemist Carl Wilhelm Scheele had used pyrolusite to produce chlorine.

Scheele and others were aware that pyrolusite contained a new element, but they were not able to isolate it.

Johan Gottlieb Gahn was the first to isolate an impure sample of manganese metal in 1774, by reducing the dioxide with carbon.
Elektron per kulit
2, 8, 13, 2
Konfigurasi elektron
[Ar] 3d5 4s2
Mn
Neanderthals may have used black manganese di oxide as a cosmetic 50,000 years ago
Sifat Fisika
Fase
Solid
Kepadatan
7,44 g/cm3
Titik lebur
1519,15 K | 1246 °C | 2274,8 °F
Titik didih
2334,15 K | 2061 °C | 3741,8 °F
Kalor peleburan
13,2 kJ/mol
Kalor penguapan
220 kJ/mol
Kapasitas kalor molar
0,479 J/g·K
Kelimpahan di kerak bumi
0,11%
Kelimpahan di alam semesta
0,0008%
Small
Kredit Gambar: Images-of-elements
Small pieces of manganese
Nomor CAS
7439-96-5
PubChem CID Number
23930
Sifat Atom
Jari-jari atom
127 pm
Jari-jari kovalen
139 pm
Elektronegativitas
1,55 (Skala Pauling)
Potensi Ionisasi
7,434 eV
Volume atom
7,4 cm3/mol
Kondusivitas termal
0,0782 W/cm·K
Bilangan oksidasi
-3, -2, -1, 1, 2, 3, 4, 5, 6, 7
Aplikasi
For over 2000 years, manganese dioxide has been used to make colorless glass.

Manganese dioxide is used as the cathode material in zinc-carbon and alkaline batteries.

Manganese also functions in the oxygen-evolving complex of photosynthetic plants.

The dioxide is also used in the preparation of oxygen and chlorine and in drying black paints.
Excess manganese, particularly inhalation of the powder, is toxic
Isotop
Isotop stabil
55Mn
Isotop tidak stabil
44Mn, 45Mn, 46Mn, 47Mn, 48Mn, 49Mn, 50Mn, 51Mn, 52Mn, 53Mn, 54Mn, 56Mn, 57Mn, 58Mn, 59Mn, 60Mn, 61Mn, 62Mn, 63Mn, 64Mn, 65Mn, 66Mn, 67Mn, 68Mn, 69Mn