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Stronsium,  38Sr
Strontium destilled crystals.jpg
Sifat umum
Nama, simbolstronsium, Sr
Pengucapan/ˈstrɒnʃiəm/
STRON-shee-əm;
/ˈstrɒntiəm/
STRON-tee-əm;
/ˈstrɒnʃəm/ STRON-shəm
Penampilanputih keperakan metalik
Stronsium di tabel periodik
Hydrogen (diatomic nonmetal)
Helium (noble gas)
Litium (alkali metal)
Berilium (alkaline earth metal)
Boron (metalloid)
Karbon (polyatomic nonmetal)
Nitrogen (diatomic nonmetal)
Oksigen (diatomic nonmetal)
Fluor (diatomic nonmetal)
Neon (noble gas)
Natrium (alkali metal)
Magnesium (alkaline earth metal)
Aluminium (post-transition metal)
Silikon (metalloid)
Fosfor (polyatomic nonmetal)
Belerang (polyatomic nonmetal)
Klor (diatomic nonmetal)
Argon (noble gas)
Kalium (alkali metal)
Kalsium (alkaline earth metal)
Skandium (transition metal)
Titanium (transition metal)
Vanadium (transition metal)
Kromium (transition metal)
Mangan (transition metal)
Besi (transition metal)
Kobalt (transition metal)
Nikel (transition metal)
Tembaga (transition metal)
Seng (transition metal)
Galium (post-transition metal)
Germanium (metalloid)
Arsenik (metalloid)
Selenium (polyatomic nonmetal)
Bromin (diatomic nonmetal)
Kripton (noble gas)
Rubidium (alkali metal)
Stronsium (alkaline earth metal)
Itrium (transition metal)
Zirkonium (transition metal)
Niobium (transition metal)
Molibdenum (transition metal)
Teknesium (transition metal)
Rutenium (transition metal)
Rodium (transition metal)
Paladium (transition metal)
Perak (transition metal)
Kadmium (transition metal)
Indium (post-transition metal)
Timah (post-transition metal)
Antimon (metalloid)
Telurium (metalloid)
Yodium (diatomic nonmetal)
Xenon (noble gas)
Sesium (alkali metal)
Barium (alkaline earth metal)
Lantanum (lanthanide)
Serium (lanthanide)
Praseodimium (lanthanide)
Neodimium (lanthanide)
Prometium (lanthanide)
Samarium (lanthanide)
Europium (lanthanide)
Gadolinium (lanthanide)
Terbium (lanthanide)
Disprosium (lanthanide)
Holmium (lanthanide)
Erbium (lanthanide)
Tulium (lanthanide)
Iterbium (lanthanide)
Lutesium (lanthanide)
Hafnium (transition metal)
Tantalum (transition metal)
Tungsten (transition metal)
Renium (transition metal)
Osmium (transition metal)
Iridium (transition metal)
Platinum (transition metal)
Emas (transition metal)
Raksa (transition metal)
Talium (post-transition metal)
Timbal (post-transition metal)
Bismut (post-transition metal)
Polonium (post-transition metal)
Astatin (metalloid)
Radon (noble gas)
Fransium (alkali metal)
Radium (alkaline earth metal)
Aktinium (actinide)
Torium (actinide)
Protaktinium (actinide)
Uranium (actinide)
Neptunium (actinide)
Plutonium (actinide)
Amerisium (actinide)
Kurium (actinide)
Berkelium (actinide)
Kalifornium (actinide)
Einsteinium (actinide)
Fermium (actinide)
Mendelevium (actinide)
Nobelium (actinide)
Lawrensium (actinide)
Ruterfordium (transition metal)
Dubnium (transition metal)
Seaborgium (transition metal)
Bohrium (transition metal)
Hasium (transition metal)
Meitnerium (unknown chemical properties)
Darmstadtium (unknown chemical properties)
Roentgenium (unknown chemical properties)
Kopernisium (transition metal)
Nihonium (unknown chemical properties)
Flerovium (post-transition metal)
Moskovium (unknown chemical properties)
Livermorium (unknown chemical properties)
Tenesin (unknown chemical properties)
Oganeson (unknown chemical properties)
Ca

Sr

Ba
rubidiumstronsiumitrium
Nomor atom (Z)38
Golongan, blokgolongan 2 (logam alkali tanah), blok-s
Periodeperiode 5
Kategori unsur  logam alkali tanah
Bobot atom standar (Ar)87.62
Konfigurasi elektron[Kr] 5s2
per kelopak
2, 8, 18, 8, 2
Sifat fisika
Fasesolid
Titik lebur1050 K ​(777 °C, ​1431 °F)
Titik didih1655 K ​(1382 °C, ​2520 °F)
Kepadatan mendekati s.k.2.64 g/cm3
saat cair, pada t.l.2.375 g/cm3
Kalor peleburan7.43 kJ/mol
Kalor penguapan136.9 kJ/mol
Kapasitas kalor molar26.4 J/(mol·K)
Tekanan uap
P (Pa) 1 10 100 1 k 10 k 100 k
at T (K) 796 882 990 1139 1345 1646
Sifat atom
Bilangan oksidasi2, 1[1] (oksida basa kuat)
ElektronegativitasSkala Pauling: 0.95
Jari-jari atomempiris: 215 pm
Jari-jari kovalen195±10 pm
Jari-jari van der Waals249 pm
Lain-lain
Struktur kristalkubus berpusat muka (fcc)
Struktur kristal Face-centered cubic untuk stronsium
Ekspansi kalor22.5 µm/(m·K) (suhu 25 °C)
Konduktivitas termal35.4 W/(m·K)
Resistivitas listrik132 n Ω·m (suhu 20 °C)
Arah magnetparamagnetik
Modulus Shear6.1 GPa
Rasio Poisson0.28
Skala Mohs1.5
Nomor CAS7440-24-6
Isotop stronsium terstabil
Iso­top Kelim­pahan Waktu paruh (t1/2) Moda peluruhan Pro­duk
82Sr syn 25.36 h ε 82Rb
83Sr syn 1.35 d ε 83Rb
β+ 83Rb
γ -
84Sr 0.56% 84Sr stabil dengan 46 neutron
85Sr syn 64.84 d ε 85Rb
γ -
86Sr 9.86% 86Sr stabil dengan 48 neutron
87Sr 7.0% 87Sr stabil dengan 49 neutron
88Sr 82.58% 88Sr stabil dengan 50 neutron
89Sr syn 50.52 d ε 89Rb
β 89Y
90Sr trace 28.90 y β 90Y
| referensi | di Wikidata

Referensi

  1. ^ P. Colarusso; et al. (1996). "High-Resolution Infrared Emission Spectrum of Strontium Monofluoride" (PDF). J. Molecular Spectroscopy. 175: 158. doi:10.1006/jmsp.1996.0019.