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praseodymium
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Praseodimium

cerium ← praseodimium → neodimium
-
↑
Pr
↓
Pa
Penampilan
putih keabuan
Ciri-ciri umum
Nama, lambang, Nomor atompraseodimium, Pr, 59
Dibaca/ˌpreɪzi.ɵˈdɪmiəm/ PRAY-zee-o-DIM-ee-əm
or /ˌpreɪsi.ɵˈdɪmiəm/ PRAY-see-o-DIM-ee-əm
Macam unsurlantanida
Golongan, periode, blok[[Unsur golongan {{{group}}}|{{{group}}}]], 6, f
Massa atom standar140.90765
Konfigurasi elektron[Xe] 4f3 6s2
2, 8, 18, 21, 8, 2
Sifat fisika
Fasesolid
Massa macam (mendekati suhu kamar)6.77 g·cm−3
Massa macam air pada t.l.6.50 g·cm−3
Titik lebur1208 K, 935 °C, 1715 °F
Titik didih3793 K, 3520 °C, 6368 °F
Kalor peleburan6.89 kJ·mol−1
Kalor penguapan331 kJ·mol−1
Kapasitas kalor27.20 J·mol−1·K−1
Tekanan uap
P (Pa)1101001 k10 k100 k
at T (K)17711973(2227)(2571)(3054)(3779)
Sifat atom
Bilangan oksidasi4, 3, 2 (oksida basa persangkaan kuat)
Elektronegativitas1.13 (skala Pauling)
Energi ionisasipertama: 527 kJ·mol−1
ke-2: 1020 kJ·mol−1
ke-3: 2086 kJ·mol−1
Jari-jari atom182 pm
Jari-jari kovalen203±7 pm
Lain-lain
Susunan kristalheksagonal
Pembenahan magnetikparamagnetik[1]
Keterhambatan elektris(r.t.) (α, poly)
0.700 µΩ·m
Konduktivitas termal12.5 W·m−1·K−1
Ekspansi termal(r.t.) (α, poly) 6.7 µm/(m·K)
Kecepatan suara (batang ringan)(20 °C) 2280 m·s−1
Modulus Young(α form) 37.3 GPa
Modulus Shear(α form) 14.8 GPa
Bulk modulus(α form) 28.8 GPa
Rasio Poisson(α form) 0.281
Kekerasan Viker400 MPa
Kekerasan Brinell481 MPa
Nomor CAS7440-10-0
Isotop paling stabil
Artikel utama: Isotop dari praseodimium
isoNAWaktu paruhDMDE (MeV)DP
141Pr100%Pr stabil dengan 82 neutron
142Prsyn19.12 hβ−2.162142Nd
ε0.745142Ce
143Prsyn13.57 dβ−0.934143Nd
· r


Praseodimium yaitu suatu unsur kimia dalam tabel periodik yang memiliki lambang Pr dan nomor atom 59.

Referensi

  1. ^ M. Jackson "Magnetism of Rare Earth" The IRM quarterly col. 10, No. 3, p. 1, 2000
 
 

Sumber :
wiki.edunitas.com, id.wikipedia.org, m.andrafarm.com, pasar.andrafarm.com, dan lain-lain.



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