Basic Information
Bohr Model
Static
Interactive
Descriptive Numbers
CAS Number
7440-68-8
Mendeleev Number
110
Pettifor Number
96
Glawe Number
98
Mass
Atomic Mass
210 Da
Periodic Position
X Position
17
Y Position
6
Period
6
Group
17
Classification
Block
p
Category
Metalloid
Geochemical
U/Th decay series
Goldschmidt
Synthetic
Color
Jmol
#754F45
Molcas Gv
#754F45
CPK
#FF1493
Atomic Radius
Calculated
127
Van Der Waals
202
Rahm
247
Uff
475
Mm3
251
Truhlar
202
Covalent (Triple Bound)
138
Covalent (Cordero)
150
Covalent (Pyykko)
147
Covalent (Pyykko Double)
138
Covalent (Pyykko Triple)
138
Temperature
Melting/Freeze (USE)
575 °K
Boiling/Density (USE)
610 °K
Density
STP
6.35 kg/cm³
Heat
Adiabatic Index
N/A
Etymology
Description
It is a radioactive and halogen element. It occurs naturally as a result of the decay of uranium and thorium. There are at least 20 known isotopes. The most stable, At-210, has a half-life of 8.3 hours. In 1940 D.R. Corson, K.R. It was synthesized by nuclear bombardment at the University of California by MacKenzie and E. Segre.
Language Of Origin
Greek
Origin Of Word
From the Greek astatos meaning "undecided"
Meaning
unbalanced
Symbol Origin
I was fickle
Etymological Description
Astatos means "undecided".
Discovery & Isolation
Observed/Predicted By
R. Corson, R. MacKenzie and E. Segrè
Observed/Discovery Year
1898
Production & Use
Sources
It is not found in nature. It is similar to iodine. It is obtained by bombarding bismuth with alpha particles.
Uses
Astatine has no significant commercial use because its isotopes have very short half-lives.
Radioactivity
Half Life
8.06 seconds
Lifetime
11.7 seconds
Decay Mode
Beta + bozunumu
Electron Affinity
Electron Affinity (eV)
2.8
Electron Affinity (kJ/mol)
233
Electron Affinity (pauling)
2.2
Electron Affinity (allen)
14.1
Electron Affinity (ghosh)
0.19131
Dipole Polarity
Accepted
42
Uncertainty
4
C6 GB
351
Electron & Quantum
Oxidation States
−1,1,3,5,7
Electron Configuration
1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f14 5d10 6p5
Quantum Number
hat/a
Electron Configuration Semantic
[Rook] 4f14 5d10 6s2 6p5
Shells-0
2
Shells-1
8
Shells-2
18
Shells-3
32
Shells-4
18
Shells-5
7
Ionization Energies-0
899.003
