Ac Actinium – Element Information, Facts, Properties, Trends,Uses, Comparison with other elements

89
Ac
Actinium

Actinium

Element 89 of Periodic table is Actinium with atomic number 89, atomic weight 227. Actinium, symbol Ac, has a Face Centered Cubic structure and Silver color. Actinium is a actinide element. Know everything about Actinium Facts, Physical Properties, Chemical Properties, Electronic configuration, Atomic and Crystal Structure.

89 Ac - Actinium | SchoolMyKids

Actinium is a radioactive chemical element with symbol Ac (not to be confused with the abbreviation for an acetyl group) and atomic number 89, which was discovered in 1899. It was the first non-primordial radioactive element to be isolated. Polonium, radium and radon were observed before actinium, but they were not isolated until 1902.

How to Locate Actinium on Periodic Table

Periodic table is arranged by atomic number, number of protons in the nucleus which is same as number of electrons. The atomic number increases from left to right. Periodic table starts at top left ( Atomic number 1) and ends at bottom right (atomic number 118). Therefore you can directly look for atomic number 89 to find Actinium on periodic table.

Another way to read periodic table and locate an element is by using group number (column) and period number (row). To locate Actinium on periodic table look for cross section of group N/A and period 7 in the modern periodic table.

Table of Contents

Actinium History

The element Actinium was discovered by Friedrich Oskar Giesel in year 1899 in France . Actinium derived its name from the Greek aktis, 'ray'

Actinium Presence: Abundance in Nature and Around Us

The table below shows the abundance of Actinium in Universe, Sun, Meteorites, Earth's Crust, Oceans and Human Body.

  Ppb by weight (1ppb =10^-7 %)
Abundance in Universe N/A
Abundance in Sun None
Abundance in Meteorites N/A
Abundance in Earth's Crust N/A
Abundance in Oceans N/A
Abundance in Humans None

Crystal Structure of Actinium

The solid state structure of Actinium is Face Centered Cubic.

The Crystal structure can be described in terms of its unit Cell. The unit Cells repeats itself in three dimensional space to form the structure.

Unit Cell Parameters

The unit cell is represented in terms of its lattice parameters, which are the lengths of the cell edges Lattice Constants (a, b and c)

a b c
567 567 567 pm

and the angles between them Lattice Angles (alpha, beta and gamma).

alpha beta gamma
π/2 π/2 π/2

The positions of the atoms inside the unit cell are described by the set of atomic positions ( xi, yi, zi) measured from a reference lattice point.

The symmetry properties of the crystal are described by the concept of space groups. All possible symmetric arrangements of particles in three-dimensional space are described by the 230 space groups (219 distinct types, or 230 if chiral copies are considered distinct.

Space Group Name Fm_ 3m 89 Ac Actinium - Crystal Structure | SchoolMyKids
Space Group Number 225
Crystal Structure Face Centered Cubic

Actinium Atomic and Orbital Properties

Actinium atoms have 89 electrons and the electronic shell structure is [2, 8, 18, 32, 18, 9, 2] with Atomic Term Symbol (Quantum Numbers) 2D3/2.

Atomic Number 89
Number of Electrons (with no charge) 89
Number of Protons 89
Mass Number 227
Number of Neutrons 138
Shell structure (Electrons per energy level) [2, 8, 18, 32, 18, 9, 2]
Electron Configuration [Rn] 6d1 7s2
Valence Electrons 6d1 7s2
Oxidation State 3
Atomic Term Symbol (Quantum Numbers) 2D3/2

Shell Structure of Actinium - Electrons per energy level

89 Ac Actinium - Electron Shell Structure | SchoolMyKids
n s p d f
1 K 2
2 L 2 6
3 M 2 6 10
4 N 2 6 10 14
5 O 2 6 10
6 P 2 6 1
7 Q 2

Ground State Electronic Configuration of Actinium - neutral Actinium atom

The ground state electronic configuration of Neutral Actinium atom is [Rn] 6d1 7s2. The portion of Actinium configuration that is equivalent to the noble gas of the preceding period, is abbreviated as [Rn]. For atoms with many electrons, this notation can become lengthy and so an abbreviated notation is used.This is important as it is the Valence electrons 6d1 7s2, electrons in the outermost shell that determine the chemical properties of the element.

Unabbreviated electronic configuration of neutral Actinium

Complete ground state electronic configuration for the Actinium atom, Unabbreviated electronic configuration

1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s2 5p6 4f14 5d10 6s2 6p6 6d1 7s2

Atomic Structure of Actinium

Actinium atomic radius is 195 pm, while it's covalent radius is N/A.

Atomic Radius

195 pm (1.95 Å)

Atomic Volume 22.542204568 cm3
Covalent Radius N/A
Van der Waals Radius N/A
Neutron Cross Section 810 σa/barns

Atomic Spectrum of Actinium

Atomic Spectrum of Actinium | SchoolMyKids

Actinium Chemical Properties: Actinium Ionization Energies and electron affinity

The electron affinity of Actinium is N/A

Valence 3
Electronegativity 1.1
ElectronAffinity N/A

Ionization Energy of Actinium

Refer to table below for Ionization energies of Actinium

Ionization energy number Enthalpy - kJ/mol
1 499
2 1170

Actinium Physical Properties

Refer to below table for Actinium Physical Properties

Density 10.07 g/cm3
Molar Volume 22.542204568 cm3

Elastic Properties

Young Modulus N/A
Shear Modulus N/A
Bulk Modulus N/A
Poisson Ratio N/A

Hardness of Actinium - Tests to Measure of Hardness of Element

Mohs Hardness N/A
Vickers Hardness N/A
Brinell Hardness N/A

Actinium Electrical Properties

Actinium is N/A of electricity. Refer to table below for the Electrical properties of Actinium

Electrical Conductivity N/A
Resistivity N/A
Superconducting Point N/A

Actinium Heat and Conduction Properties

Thermal Conductivity 12 W/(m K)
Thermal Expansion N/A

Actinium Magnetic Properties

Magnetic Type N/A
Curie Point N/A
Mass Magnetic Susceptibility N/A
Molar Magnetic Susceptibility N/A
Volume Magnetic Susceptibility N/A

Optical Properties of Actinium

Refractive Index N/A

Acoustic Properties of Actinium

Speed of Sound N/A

Actinium Thermal Properties - Enthalpies and thermodynamics

Refer to table below for Thermal properties of Actinium

Melting Point 1323 K (1050 °C)
Boiling Point 3473 K (3200 °C)
Critical Temperature N/A
Superconducting Point N/A

Enthalpies of Actinium

Heat of Fusion 14 kJ/mol
Heat of Vaporization 400 kJ/mol
Heat of Combustion N/A

Actinium Isotopes - Nuclear Properties of Actinium

Isotopes of rhodium. Naturally occurring Actinium has 1 stable isotope - None.

Isotope Isotope Mass % Abundance T half Decay Mode
206Ac  
207Ac  
208Ac  
209Ac  
210Ac  
211Ac  
212Ac  
213Ac  
214Ac  
215Ac  
216Ac  
217Ac  
218Ac  
219Ac  
220Ac  
221Ac  
222Ac  
223Ac  
224Ac  
225Ac  
226Ac  
227Ac  
228Ac  
229Ac  
230Ac  
231Ac  
232Ac  
233Ac  
234Ac  
235Ac  
236Ac  

Regulatory and Health - Health and Safety Parameters and Guidelines

CAS Number CAS7440-34-8
RTECS Number N/A
DOT Hazard Class N/A
DOT Numbers N/A
EU Number N/A
NFPA Fire Rating N/A
NFPA Hazards N/A
NFPA Health Rating N/A
NFPA Reactivity Rating N/A
Autoignition Point N/A
Flashpoint N/A

Database Search

List of unique identifiers to search the element in various chemical registry databases

Database Identifier number
CAS Number - Chemical Abstracts Service (CAS) CAS7440-34-8
CID Number N/A
Gmelin Number N/A
NSC Number N/A
RTECS Number N/A

List of Elements
1 H - Hydrogen
2 He - Helium
3 Li - Lithium
4 Be - Beryllium
5 B - Boron
6 C - Carbon
7 N - Nitrogen
8 O - Oxygen
9 F - Fluorine
10 Ne - Neon
11 Na - Sodium
12 Mg - Magnesium
13 Al - Aluminium
14 Si - Silicon
15 P - Phosphorus
16 S - Sulfur
17 Cl - Chlorine
18 Ar - Argon
19 K - Potassium
20 Ca - Calcium
21 Sc - Scandium
22 Ti - Titanium
23 V - Vanadium
24 Cr - Chromium
25 Mn - Manganese
26 Fe - Iron
27 Co - Cobalt
28 Ni - Nickel
29 Cu - Copper
30 Zn - Zinc
31 Ga - Gallium
32 Ge - Germanium
33 As - Arsenic
34 Se - Selenium
35 Br - Bromine
36 Kr - Krypton
37 Rb - Rubidium
38 Sr - Strontium
39 Y - Yttrium
40 Zr - Zirconium
41 Nb - Niobium
42 Mo - Molybdenum
43 Tc - Technetium
44 Ru - Ruthenium
45 Rh - Rhodium
46 Pd - Palladium
47 Ag - Silver
48 Cd - Cadmium
49 In - Indium
50 Sn - Tin
51 Sb - Antimony
52 Te - Tellurium
53 I - Iodine
54 Xe - Xenon
55 Cs - Cesium
56 Ba - Barium
57 La - Lanthanum
58 Ce - Cerium
59 Pr - Praseodymium
60 Nd - Neodymium
61 Pm - Promethium
62 Sm - Samarium
63 Eu - Europium
64 Gd - Gadolinium
65 Tb - Terbium
66 Dy - Dysprosium
67 Ho - Holmium
68 Er - Erbium
69 Tm - Thulium
70 Yb - Ytterbium
71 Lu - Lutetium
72 Hf - Hafnium
73 Ta - Tantalum
74 W - Tungsten
75 Re - Rhenium
76 Os - Osmium
77 Ir - Iridium
78 Pt - Platinum
79 Au - Gold
80 Hg - Mercury
81 Tl - Thallium
82 Pb - Lead
83 Bi - Bismuth
84 Po - Polonium
85 At - Astatine
86 Rn - Radon
87 Fr - Francium
88 Ra - Radium
89 Ac - Actinium
90 Th - Thorium
91 Pa - Protactinium
92 U - Uranium
93 Np - Neptunium
94 Pu - Plutonium
95 Am - Americium
96 Cm - Curium
97 Bk - Berkelium
98 Cf - Californium
99 Es - Einsteinium
100 Fm - Fermium
101 Md - Mendelevium
102 No - Nobelium
103 Lr - Lawrencium
104 Rf - Rutherfordium
105 Db - Dubnium
106 Sg - Seaborgium
107 Bh - Bohrium
108 Hs - Hassium
109 Mt - Meitnerium
110 Ds - Darmstadtium
111 Rg - Roentgenium
112 Cn - Copernicium
113 Nh - Nihonium
114 Fl - Flerovium
115 Mc - Moscovium
116 Lv - Livermorium
117 Ts - Tennessine
118 Og - Oganesson
Metalloid
Nonmetals
Other Nonmetals
Halogens Noble Gas
Metals
Alkali Metals Alkaline Earth Metals
Transition Metals Post-Transition Metals
Lanthanide Actinide