Americium (Am) – Periodic Table [Element Information & More]

americium element periodic table

Americium element (Am) is in period 7 of a periodic table. Americium is in the f-block and it is classified as an actinide on the periodic table.

There is a lot more information related to americium which is mentioned in the Information Table given below.

So let’s dive right into it!

Table of contents

Americium Element (Information Table)

The important data related to americium element is given in the table below.

Appearance of americiumSilvery white metallic appearance
Atomic number of americium95
Symbol of americiumAm
Atomic mass of americium (most stable isotope)243 u
Protons, Neutrons & Electrons in americiumProtons: 95, Neutrons: 148, Electrons: 95
State of americium (at STP)Solid
Period number of americium in periodic table7
Block of americium in periodic tablef-block
Category of americiumInner transition metals
Bohr model or Electrons per shell or Electrons arrangement in americium2, 8, 18, 32, 25, 8, 2
Electron configuration of americium[Rn] 5f7 7s2
Orbital diagram of americiumorbital diagram of americium
Atomic radius of americium (van der Waals radius)244 picometers
Density of americium13.67 g/cm3
1st ionization energy of americium5.993 eV
Main isotope of americium241Am and 243Am
Melting point of americium1449 K or 1176 °C or 2149 °F
Boiling point of americium (calculated values)2880 K or 2607 °C or 4725 °F
Crystal structure of americiumDouble hexagonal close packed
Discovery of americiumBy Glenn T. Seaborg, Albert Ghiorso, Leon O. Morgan, Ralph A. James (in 1944)

Also see: Interactive Periodic Table (It has rotating bohr models as well as many other details of all the 118 elements in a single periodic table).

Americium element in Periodic table

The Americium element (Am) has the atomic number 95 and is located in period 7. Americium is a metal and it is classified as an actinide group element.

Click on above elements in the periodic table to see their information.

Facts about americium

Here are a few interesting facts about the americium element.

  1. Glenn T. Seaborg, Albert Ghiorso, Leon O. Morgan and Ralph A. James discovered the americium element in the year 1944.
  2. Americium was given its name from “America”.
  3. There are around 19 isotopes of americium and all these isotopes are radioactive in nature.
  4. 243Am is the isotope of americium which is most stable and has a half life of 7370 years.
  5. Americium is naturally available from uranium ores, but this naturally available uranium is very rare in quantity. Most of the americium is produced artificially in the lab.

Properties of americium

Here is a list of some physical properties and chemical properties of americium.

Physical properties of americium

  • Americium has a silvery white appearance.
  • Americium has double hexagonal close packed crystal structure.
  • The melting point of americium is 1449 K and its boiling point is 2880 K (these are calculated values).

Chemical properties of americium

  • Americium is a toxic and radioactive metal.
  • Pure americium reacts with the atmospheric oxygen and starts tarnishing.
  • The most common oxidation state of americium is +3. Apart from this, it also has other oxidation states ranging from +2 to +7.

Uses of americium

Here are some uses of the americium element.

  • 241Am is the isotope of americium (which is present in the compound americium dioxide) is used in household smoke detectors.
  • 241Am is also used in some industrial applications as well as some medical applications.
  • Americium can also be used to produce other transuranic elements.

External resources:

  1. Americium – Wikipedia. (2023, February 11). Americium – Wikipedia.
  2. Americium – Element information, properties and uses | Periodic Table. (n.d.). Americium – Element Information, Properties and Uses | Periodic Table.
  3. Bondi, A. (1964, March). van der Waals Volumes and Radii. The Journal of Physical Chemistry, 68(3), 441–451.
  4. Holden, et al. (2018, December 1). IUPAC Periodic Table of the Elements and Isotopes (IPTEI) for the Education Community (IUPAC Technical Report). Pure and Applied Chemistry, 90(12), 1833–2092.
  5. Zhang, et al. (2011, January 11). Corrected Values for Boiling Points and Enthalpies of Vaporization of Elements in Handbooks. Journal of Chemical & Engineering Data, 56(2), 328–337.
  6. P. (n.d.). Americium | Am (Element) – PubChem. Americium | Am (Element) – PubChem.
  7. It’s Elemental – The Element Americium. (n.d.). It’s Elemental – the Element Americium.
  8. Radionuclide Basics: Americium-241 | US EPA. (2015, April 14). US EPA.
  9. Americium | CCDC. (n.d.). Americium | CCDC.
  10. Prohaska, T., et al. (2022, May 1). Standard atomic weights of the elements 2021 (IUPAC Technical Report). Pure and Applied Chemistry, 94(5), 573–600.
  11. Haynes, W. M. (Ed.). (2014, June 4). CRC Handbook of Chemistry and Physics.
  12. Kaye, G W.C., & Laby, T H. Tables of physical and chemical constants. 15th Edition. United States.
  13. Sansonetti, J. E., & Martin, W. C. (2005, December). Handbook of Basic Atomic Spectroscopic Data. Journal of Physical and Chemical Reference Data, 34(4), 1559–2259.

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