Astatine Element (Periodic Table)

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Astatine

Astatine (At) is a chemical element of the periodic table, located in the group 17 and the period 6, and is having the atomic number 85. It is a dark, black, lustrous post transition metal, whose name comes from the Greek word “astatos”, which means unstable. It is highly toxic and is counted as one of the radioactive elements. It is the rarest element on earth and is counted as one of the heaviest elements in the halogen group.

group
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
period
1
 1
H
 2
He
2
 3
Li
 4
Be
 5
B
 6
C
 7
N
 8
O
 9
F
 10
Ne
3
 11
Na
 12
Mg
 13
Al
 14
Si
 15
P
 16
S
 17
Cl
 18
Ar
4
 19
K
 20
Ca
 21
Sc
 22
Ti
 23
V
 24
Cr
 25
Mn
 26
Fe
 27
Co
 28
Ni
 29
Cu
 30
Zn
 31
Ga
 32
Ge
 33
As
 34
Se
 35
Br
 36
Kr
5
 37
Rb
 38
Sr
 39
Y
 40
Zr
 41
Nb
 42
Mo
 43
Tc
 44
Ru
 45
Rh
 46
Pd
 47
Ag
 48
Cd
 49
In
 50
Sn
 51
Sb
 52
Te
 53
I
 54
Xe
6
 55
Cs
 56
Ba
 72
Hf
 73
Ta
 74
W
 75
Re
 76
Os
 77
Ir
 78
Pt
 79
Au
 80
Hg
 81
Tl
 82
Pb
 83
Bi
 84
Po
 85
At
 86
Rn
7
 87
Fr
 88
Ra
 104
Rf
 105
Db
 106
Sg
 107
Bh
 108
Hs
 109
Mt
 110
Ds
 111
Rg
 112
Cn
 113
Nh
 114
Fl
 115
Mc
 116
Lv
 117
Ts
 118
Og
57
La
 58
Ce
 59
Pr
 60
Nd
 61
Pm
 62
Sm
 63
Eu
 64
Gd
 65
Tb
 66
Dy
 67
Ho
 68
Er
 69
Tm
 70
Yb
 71
Lu
89
Ac
 90
Th
 91
Pa
 92
U
 93
Np
 94
Pu
 95
Am
 96
Cm
 97
Bk
 98
Cf
 99
Es
 100
Fm
 101
Md
 102
No
 103
Lr
– p block

FAQs on Astatine Element

Astatine
‣ What does astatine look like?

Appearance: unknown, probably metallic
‣ When was the element astatine discovered and by who?

Discovery: Dale R. Corson, Kenneth Ross MacKenzie, Emilio Segre (1940)
‣ Where is astatine located on the periodic table?

Astatine Periodic Table

Location: Astatine is found in the sixth row of the periodic table below the iodine element.
‣ What is the atomic number of astatine?

Atomic number (Z): 85
‣ What is the chemical symbol of astatine?

Symbol: At
‣ Astatine atomic weight: [210]
‣ What block does astatine belong to?

Block: p-block
‣ What group is astatine in on the periodic table?

Group: 17 (halogens)
‣ What period is astatine in the periodic table?

Period: 6
‣ How many electron shells does astatine have?

Electrons per shell: 2, 8, 18, 32, 18, 7
‣ What is the electron configuration of astatine?

Electron configuration: [Xe] 4f14 5d10 6s2 6p5
‣ What is the ionization energy of astatine?

Ionization energies:
1st: 899.003 kJ/mol
‣ What is the phase of astatine?

Phase (at r.t): unknown phase
‣ Astatine natural occurrence: from decay
‣ Astatine oxidation state: -1, +1, +3, +5, +7
‣ Astatine CAS number: 7440-68-8

‣ How many isotopes does astatine have?

Main isotopes of astatine
IsotopeAbundanceHalf-life (t1/2)Decay modeProduct
209Atsyn5.41 hβ+
α		209Po
205Bi
210Atsyn8.1 hβ+
α		210Po
206Bi
211Atsyn7.21 hε
α		211Po
207Bi

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