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

Americium (Am) element Periodic table

This is a SUPER easy guide on Americium element.

In fact, the table mentioned below is the perfect information box (Which gives you every single detail about the Americium element in Periodic table.)

So if you want to know anything about Americium element, then this guide is for you.

Let’s finish this very quickly.

Americium Element (Am) Information

Appearance of Americium appearance of americium
Silvery-white metallic appearance
State of Americium at STPSolid
Position of Americium in Periodic tableamericium in periodic table (Position)
Group: actinides, Period: 7, Block: f
Category of Americium elementamericium element category
Inner transition metals
Atomic number of Americium, or 
Protons in Americium
95
Neutrons in Americium148
Electrons in Americium95
Symbol of AmericiumAm
Atomic mass of Americium (most stable isotope) americium (Am) atomic mass
243 u
Electrons arrangement in Americium

or 

Bohr model of Americium
Bohr model of americium (Electrons arrangement in americium, Am)
2, 8, 18, 32, 25, 8, 2
Electronic configuration of Americium[Rn] 5f7 7s2
Atomic radius of Americiumamericium (Am) atomic radius
244 picometers (van der Waals radius)
1st Ionization energy of Americium5.993 eV
Electronegativity of Americium Electronegativity of americium (Am)
1.3 (Pauling scale)
Crystal structure of Americiumcrystal structure of americium
Double hexagonal close packed
Melting point of Americium1449 K or 1176 °C or 2149 °F
Boiling point of Americium2880 K or 2607 °C or 4725 °F
Density of Americium13.67 g/cm3
Main isotopes of Americium241Am and 243Am
Who discovered Americium and when?Glenn T. Seaborg, Albert Ghiorso, Leon O. Morgan, Ralph A. James (in 1944)
CAS number7440-35-9

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Americium in Periodic table

Americium element is in period 7 and in actinides group of the Periodic table. Americium is the f-block element and it belongs to inner transition metals group.

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Why is Americium in Period 7?

Why is Americium in Period 7

Let me ask you a question.

How many shells does americium have?

It’s 7. Right?

You have already seen the bohr model of americium atom in the above table.

From the Bohr model, it can be found that the number of orbits or shells in americium is 7. Hence, as americium has 7 orbits, it lies in period 7 of the Periodic table. 

Why is Americium in f-block?

Why is Americium in f-block

Before knowing this reason, first of all I want to ask you a simple question.

How can you determine the blocks-wise position of elements?

The simple answer: The elements will lie in the s, p, d or f block will completely depend upon the subshell in which the last electron will enter.

For example; the electron configuration of americium is [Rn] 5f7 7s2.

So the last electron of americium enters the f-subshell or f-orbital. 

Hence, americium is the f-block element.

5 Interesting facts about Americium

Interesting facts about americium element are mentioned below.

  1. The name “Americium” was derived from “America”.
  2. Americium was discovered by Glenn T. Seaborg, Albert Ghiorso, Leon O. Morgan and Ralph A. James in 1944.
  3. Americium element is generally produced artificially in laboratory, but it also occurs naturally in trace amounts in uranium ores.
  4. Americium has around 19 isotopes and all those isotopes are radioactive in nature.
  5. Out of many isotopes of americium, the most stable isotope is 243Am, which has a half life of 7370 years.

Properties of Americium

The physical and chemical properties of americium element are mentioned below.

Physical properties of Americium

Physical properties of americium are mentioned below.

  • Americium is a solid metal having a silvery-white metallic appearance.
  • The density of americium metal is 13.67 g/cm3, which is near to the density of mercury at room temperature.
  • The calculated melting points and boiling points of americium element are 1176 °C and 2607 °C respectively.
  • The crystal structure of americium is double hexagonal close packed.

Chemical properties of Americium

Chemical properties of americium are mentioned below.

  • Americium is radioactive as well as toxic metal.
  • When pure americium metal is kept open in the dry air, it starts tarnishing due to reaction with oxygen.
  • There are many oxidation states of americium ranging from +2 to +7, but its most stable oxidation state is +3.

Uses of Americium

The uses of americium are mentioned below.

  • Americium dioxide, which contains the isotope 241Am, is used in household smoke detectors.
  • 241Am is a good source of gamma rays and hence it is used in some medical applications as well as other industrial applications.
  • Americium is used for production of other transuranic elements.
  • It is also used as a fuel in spacecraft batteries.

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References:
Chemical data: Wikipedia, Chemspider
Am element: Image by Bionerd, CC BY 3.0, via Wikimedia Commons

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