Astatine Element (Periodic Table)

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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