Astato

Gikan sa Wikipedia, ang gawasnong ensiklopedya
Astatine
85At
I

At

Uus
poloniumastatineradon
Appearance
unknown, but probably a black solid; possibly metallic in appearance
General properties
Name, simbolo, kaiphan astatine, At, 85
Pronunciation Plantilya:IPAc-en Plantilya:Respell
or Plantilya:IPAc-en Plantilya:Respell
Element category halogen
sometimes classified as a metalloid (disputed)
Group, period, block 176, p
Standard atomic weight (210)
Electron configuration [Xe] 4f14 5d10 6s2 6p5
2, 8, 18, 32, 18, 7
Electron shells of astatine (2, 8, 18, 32, 18, 7)
History
Discovery Dale R. Corson, Kenneth Ross MacKenzie, Emilio Segrè (1940)
Physical properties
Phase magahi
Melting point 575 K, 302 °C, 576 °F
Boiling point 610 K, 337 °C, 639 °F
Heat of vaporization (At2) 54.39 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, +1, +3, +5, +7
Electronegativity 2.2 (Pauling scale)
Ionization energies 1st: 887.7±38.59 kJ·mol−1
Covalent radius 150 pm
Van der Waals radius 202 pm
Miscellanea
Magnetic ordering no data
Thermal conductivity 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
209At syn 5.41 h β+ 3.486 209Po
α 5.758 205Bi
210At syn 8.1 h β+ 3.981 210Po
α 5.632 206Bi
211At syn 7.21 h ε 0.786 211Po
α 5.983 207Bi
t  h  u
· r

Ang astato (Iningles astatine) mao ang elementong kimiko sa talaang peryodiko nga may simbolo nga At ug kaiphan nga atomik 85. Ang astato mao ang halogen.

Ang mga gi basihan niini[usba | edit source]



Galeriya sa hulagway[usba | edit source]