We elaborate the uses of Actinium and atomic properties with characteristics. Actinium is a silver-colored chemical element with atomic number 89. Its symbol is Ac and it belongs to the group of actinides and its normal state in nature is solid. Actinium is located at position 89 on the periodic table.
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On this page you can discover the chemical properties of actinium and information about actinium and other elements of the periodic table such as lanthanum, lutetium, radium or thorium. You will also learn what actinium is for and you will know what its uses through its properties associated with actinium such as its atomic number or the usual state in which actinium can be found.
You will be able to see qualities of actinium such as its melting and boiling point, its magnetic properties or what its chemical symbol is. In addition, here you will find information about its atomic properties such as the distribution of electrons in actinium atoms and other properties.
For some elements, part of this information is unknown. In these cases we show the properties attributed to them.
Actinium properties
Actinium is part of the group of actinides. Actinides that have a higher atomic number cannot be found in nature and their life span is shorter. All isotopes in the actinide group, including actinium, are radioactive.
The state of actinium in its natural form is solid. Actinium is a silver-looking chemical element and belongs to the group of actinides. The atomic number of actinium is 89. The chemical symbol for actinium is Ac. Actinium’s melting point is 1 degrees Kelvin or -271.15 degrees Celsius or degrees Celsius. The boiling point of actinium is 3 degrees Kelvin or -269.15 degrees Celsius or degrees Centigrade.
Atomic properties of actinium
The atomic mass of an element is determined by the total mass of neutrons and protons that can be found in a single atom belonging to this element. Regarding the position to find actinium within the periodic table of elements, actinium is found in group 3 and period 7. Actinium has an atomic mass of 2.7 u.
The electron configuration of actinium is rn 6d 17s2. The electronic configuration of the elements determines the way in which the electrons are structured in the atoms of an element. The mean radius of actinium is 195 pm. Actinium has a total of 89 electrons whose distribution is as follows: In the first shell it has 2 electrons, in the second it has 8 electrons, in its third shell it has 18 electrons, in the fourth, 32 electrons, in the fifth shell it has 18 electrons, in the sixth, 9 electrons and in the seventh it has 2 electrons.
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Actinium characteristics
Below you can see a table where the main characteristics of actinium are shown.
| Actinium | ||
|---|---|---|
| Chemical symbol | Ac | |
| Atomic number | 89 | |
| Group | 3 | |
| Period | 7 | |
| Appearance | silver | |
| Block | F | |
| Density | 10,070 kg / m3 | |
| Atomic mass | 2.7 u | |
| Medium radius | 195 pm | |
| Electronic configuration | rn 6d 17s2 | |
| Electrons per shell | 2, 8, 18, 32, 18, 9, 2 | |
| Oxidation states | 3 (neutral) | |
| Crystal structure | face-centered cubic | |
| State | solid | |
| Melting point | 1K | |
| Boiling point | 3K | |
| Heat of fusion | 62 kJ / mol | |
| Electronegativity | 1.1 | |
| Thermal conductivity | 12 W / (K m) | |
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