Actinium Element (Periodic Table)

Actinium

Actinium (Ac) is a chemical element of the periodic table, located in the period 7, and has the atomic number 89. It is the first element in the actinide series. It is a soft, silvery-white metal that glows in the dark with a blue light. Its name comes from the Greek word “aktis” or “aktinos”, which means beam or ray. It is counted as one of the radioactive elements.

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
– f block

FAQs on Actinium Element

Actinium
‣ What does actinium look like?

Appearance: silvery-white, glowing with an eerie blue light; sometimes with a golden cast
‣ Who discovered actinium? When was the element actinium discovered?

Discovery and first isolation: Friedrich Oskar Giesel (1902, 1903)
‣ Where is actinium found on the periodic table?

Actinium Periodic Table

Location: Actinium is found in the seventh row of the periodic table, next to the radium element.
‣ What is the atomic number of actinium?

Atomic number (Z): 89
Actinium symbol: Ac
Atomic weight of actinium: [227]
‣ Actinium belongs to which block?

Block: f-block
‣ Period of actinium in the periodic table

Period: 7
Actinium covalent radius: 215 pm
Melting point of actinium: 1500 K (1227 °C, 2240 °F) (estimated)
‣ What is the boiling point of actinium?

Boiling point: 3500±300 K (3200±300 °C, 5800±500 °F) (extrapolated)
‣ How many electron shells does actinium have?

Electrons per shell: 2, 8, 18, 32, 18, 9, 2
‣ What is the electron configuration of actinium?

Electron configuration: [Rn] 6d1 7s2
Actinium ionization energies:
1st: 499 kJ/mol
2nd: 1170 kJ/mol
3rd: 1900 kJ/mol
‣ What is the phase of actinium?

Phase (at r.t): solid
‣ What is the density of actinium?

Density (near r.t): 10 g/cm3
Actinium natural occurrence: from decay
Common oxidation state of actinium: +3
‣ What is the electronegativity of actinium?

Electronegativity: Pauling scale: 1.1
Actinium heat of fusion: 14 kJ/mol
Actinium heat of vaporization: 400 kJ/mol
Actinium molar heat capacity: 27.2 J/(mol K)
‣ What is the structure of actinium?

Crystal structure: face centered cubic (fcc)
Thermal conductivity of actinium: 12 W/(m.K)
Actinium CAS number: 7440-34-8

‣ How many isotopes does actinium have?

Main isotopes of actinium
IsotopeAbundanceHalf-life (t1/2)Decay modeProduct
225Actrace10 dα221Fr
226Acsyn29.37 hβ
ε
α
226Th
226Ra
222Fr
227Actrace21.772 yβ
α
227Th
223Fr

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