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Fransium - Wikipedia Indonesia, ensiklopedia bebas berbahasa Indonesia

Fransium

Dari Wikipedia Indonesia, ensiklopedia bebas berbahasa Indonesia.

87 radonfranciumradium
Cs

Fr

Uue
Keterangan Umum Unsur
Nama, Lambang, Nomor atom francium, Fr, 87
Seri kimia alkali metals
Golongan, Periode, Blok 1, 7, s
Penampilan metallic
Massa atom (223) g/mol
Konfigurasi elektron [Rn] 7s1
Jumlah elektron tiap kulit 2, 8, 18, 32, 18, 8, 1
Ciri-ciri fisik
Fase solid
Densitas (sekitar suhu kamar)  ? 1.87 g/cm³
Titik lebur 300 K
(27 °C, 80 °F)
Titik didih  ? 950 K
(? 677 °C, ? °F)
Kalor peleburan ca. 2 kJ/mol
Kalor penguapan ca. 65 kJ/mol
Tekanan uap (extrapolated)
P/Pa 1 10 100 1 k 10 k 100 k
pada T/K 404 454 519 608 738 946
Ciri-ciri atom
Struktur kristal cubic body centered
Bilangan oksidasi 1
(strongly basic oxide)
Elektronegativitas 0.7 (skala Pauling)
Energi ionisasi pertama: 380 kJ/mol
Lain-lain
Sifat magnetik  ?
Electrical resistivity  ? 3 µΩ·m
Konduktivitas termal (300 K)  ? 15 W/(m·K)
Nomor CAS 7440-73-5
Isotop
iso NA waktu paruh DM DE (MeV) DP
222Fr syn 14.2 min β- 2.033 222Ra
223Fr 100% 22.00 min β- 1.149 221Ra
α 5.430 219At
Referensi

Fransium adalah suatu unsur kimia dalam tabel periodik yang memiliki lambang Fr dan nomor atom 87.


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