Astatine

polonium ← astatine → radon I ↑ At ↓ Uus 85At Periodic table
Ìfarahàn
black solid (presumed)
Àwọn ìní àníkárí
Orúkọ, àmì-ìdámọ̀, nọ́mbà	astatine, At, 85
Ẹ̀ka apilẹ̀sẹ̀	halogens
Àdìpọ̀, ìgbà, block	17, 6, p
Ìwúwo átọ́mù	(210) g·mol−1
Ìtòjọ ẹ̀lẹ́ktrónì	[Xe] 4f14 5d10 6s2 6p5
Àwọn ẹ̀lẹ́ktrónì lórí ọ̀nà kan	2, 8, 18, 32, 18, 7 (Image)
Àwọn ìní aláfójúrí
Phase	solid
ojúàmì ìyọ́	575 K, 302 °C, 576 °F
ajúàmì ìhó	610 K, 337 °C, 639 °F
Heat of vaporization	40 kJ·mol−1
Vapor pressure
P/Pa 1 10 100 1 k 10 k 100 k at T/K 361 392 429 475 531 607
Atomic properties
Oxidation states	±1, 3, 5, 7
Electronegativity	2.2 (Pauling scale)
Ionization energies	1st: 890±40 kJ·mol−1
Covalent radius	150 pm
Van der Waals radius	202 pm
Miscellanea
Magnetic ordering	no data
Thermal conductivity	(300 K) 1.7 W·m−1·K−1
CAS registry number	7440-68-8
Most stable isotopes
Main article: Isotopes of astatine
iso NA half-life DM DE (MeV) DP 210At syn 8.1 h ε, β+ 3.981 210Po α 5.631 206Bi 211At syn 7.2 h

Astatínì tabi Astatine je apilese kemika alagbararadio pelu ami-idamo At ati nomba atomu 85. Ohun eyi towuwojulo keji ninu awon halojin. Botilejepe astatini nje mimuwaye nitori ijera alagbararadio ninu adanida, nitori short aabo emi kukuru re a le ri ni iye tintin. Astatini koko je mimuwaye latowo Dale R. Corson, Kenneth Ross MacKenzie, ati Emilio Segrè ni 1940. Odun meta koja ki o to dipe ipase astatini bakanna je wiwari ninu awon alumoni aladanida. Titi di aipe opolopo awon iwuwa aladanida ati kemika astatini je nipa sise afiwe mo awon apilese miran. Melo ninu awon isotopu astatini nje lilo bi olufonsita iwonwo alpha ninu awon imulo sayensi, be sini adanwo awon imulo oniwosan fun astatini 211 ti sele. Lowolowo astatini ni apilese aladanida to sowonjulo pelu idiye bi 30g ni o wa ninu igbele Aye.