Actinium Element (Periodic Table)

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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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