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protactinium
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Protaktinium

toriumprotaktiniumuranium
Pr

Pa

(Uqu)
Penampilan
silver metalik terang
Ciri-ciri umum
Nama, lambang, Nomor atomprotaktinium, Pa, 91
Dibaca/ˌprtækˈtɪniəm/
PROH-tak-TIN-ee-əm
Jenis unsuraktinida
Golongan, periode, blokn/a, 7, f
Massa atom standar231.03588
Konfigurasi elektron[Rn] 5f2 6d1 7s2
2, 8, 18, 32, 20, 9, 2
Sifat fisika
Fasesolid
Massa jenis (mendekati suhu kamar)15.37 g·cm−3
Titik lebur1841 K, 1568 °C, 2854 °F
Titik didih ? 4300 K, ? 4027 °C, ? 7280 °F
Kalor peleburan12.34 kJ·mol−1
Kalor penguapan481 kJ·mol−1
Sifat atom
Bilangan oksidasi2, 3, 4, 5
(oksida basa lemah)
Elektronegativitas1.5 (skala Pauling)
Energi ionisasipertama: 568 kJ·mol−1
Jari-jari atom163 pm
Jari-jari kovalen200 pm
Lain-lain
Susunan kristaltetragonal
Pembenahan magnetikparamagnetik[1]
Keterhambatan elektris(0 °C) 177 nΩ·m
Konduktivitas termal47 W·m−1·K−1
Nomor CAS7440-13-3
Isotop paling stabil
Artikel utama: Isotop dari protaktinium
isoNAWaktu paruhDMDE (MeV)DP
229Pasyn1.4 dα5.58225Ac
230Pasyn17.4 dε1.310230Th
β0.563230U
231Pa~100%32760 yα5.149227Ac
232Pasyn1.31 dβ0.31232U
233Pasyn26.967 dβ0.571233U
234mPatrace1.17 minβ2.29234U
IT0.0694234Pa
234Patrace6.75 hβ0.23234U
· r

Protaktinium yaitu suatu unsur kimia dalam tabel periodik yang memiliki lambang Pa dan nomor atom 91.

Referensi

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



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