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Samarium
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Samarium

prometium ← samarium → europium
-
↑
Sm
↓
Pu
Penampilan
putih keperakan
Ciri-ciri umum
Nama, lambang, Nomor atomsamarium, Sm, 62
Dibaca/səˈmɛəriəm/ sə-MAIR-ee-əm
Jenis unsurlantanida
Golongan, periode, blok[[Unsur golongan {{{group}}}|{{{group}}}]], 6, f
Massa atom standar150.36
Konfigurasi elektron[Xe] 6s2 4f6
2, 8, 18, 24, 8, 2
Kulit elektron dari samarium (2, 8, 18, 24, 8, 2)
Sifat fisika
Fasesolid
Massa jenis (mendekati suhu kamar)7.52 g·cm−3
Massa jenis air pada t.l.7.16 g·cm−3
Titik lebur1345 K, 1072 °C, 1962 °F
Titik didih2067 K, 1794 °C, 3261 °F
Kalor peleburan8.62 kJ·mol−1
Kalor penguapan165 kJ·mol−1
Kapasitas kalor29.54 J·mol−1·K−1
Tekanan uap
P (Pa)1101001 k10 k100 k
at T (K)100111061240(1421)(1675)(2061)
Sifat atom
Bilangan oksidasi3, 2 (sedikit oksida basa)
Elektronegativitas1.17 (skala Pauling)
Energi ionisasipertama: 544.5 kJ·mol−1
ke-2: 1070 kJ·mol−1
ke-3: 2260 kJ·mol−1
Jari-jari atom180 pm
Jari-jari kovalen198±8 pm
Lain-lain
Susunan kristalrhombohedral
Pembenahan magnetikparamagnetik[1]
Keterhambatan elektris(r.t.) (α, poly) 0.940 µΩ·m
Konduktivitas termal13.3 W·m−1·K−1
Ekspansi termal(r.t.) (α, poly) 12.7 µm/(m·K)
Kecepatan suara (batang ringan)(20 °C) 2130 m·s−1
Modulus Young(α form) 49.7 GPa
Modulus Shear(α form) 19.5 GPa
Bulk modulus(α form) 37.8 GPa
Rasio Poisson(α form) 0.274
Kekerasan Viker412 MPa
Kekerasan Brinell441 MPa
Nomor CAS7440-19-9
Isotop paling stabil
Artikel utama: Isotop dari samarium
isoNAWaktu paruhDMDE (MeV)DP
144Sm3.07%Sm stabil dengan 82 neutron
146Smsyn1.03×108thnα2.529142Nd
147Sm14.99%1.06×1011thnα2.310143Nd
148Sm11.24%7×1015thnα1.986144Nd
149Sm13.82%Sm stabil dengan 87 neutron
150Sm7.38%Sm stabil dengan 88 neutron
152Sm26.75%Sm stabil dengan 90 neutron
154Sm22.75%Sm stabil dengan 92 neutron
· r

Samarium yaitu suatu unsur kimia dalam tabel periodik yang memiliki lambang Sm dan nomor atom 62.

Referensi

  1. ^ Magnetic susceptibility of the elements and inorganic compounds, in Handbook of Chemistry and Physics 81st edition, CRC press.
 
 


Sumber :
wiki.edunitas.com, id.wikipedia.org, m.andrafarm.com, pasar.andrafarm.com, dll.



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Samarium   ▩   Collection of Free Studies
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