Fermium (Fm) – Periodic Table (Element Information & More)

Fermium (Fm) element Periodic table

This is a SUPER easy guide on Fermium element.

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

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

Let’s finish this very quickly.

Fermium Element (Fm) Information

State of Fermium at STPSolid (predicted)
Position of Fermium in Periodic tableFermium in periodic table (Position)
Group: actinides, Period: 7, Block: f
Category of Fermium elementfermium element category
Inner transition metals
Atomic number of Fermium, or 
Protons in Fermium
100
Neutrons in Fermium157
Electrons in Fermium100
Symbol of FermiumFm
Atomic mass of Fermium (most stable isotope) Fermium (Fm) atomic mass
257 u
Electrons arrangement in Fermium

or 

Bohr model of Fermium
Bohr model of fermium (Electrons arrangement in fermium, Fm)
2, 8, 18, 32, 30, 8, 2
Electronic configuration of Fermium[Rn] 5f12 7s2
1st Ionization energy of Fermium6.50 eV
Electronegativity of Fermium Electronegativity of fermium (Fm)
1.3 (Pauling scale)
Crystal structure of Fermium (predicted)crystal structure of fermium
FCC (face centered cubic)
Melting point of Fermium (predicted)1800 K or 1527 °C or 2781 °F
Density of Fermium (predicted)9.7 g/cm3
Main isotope of Fermium257Fm
Who discovered Fermium and when?Albert Ghiorso and his team (in 1952)
CAS number7440-72-4

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Fermium in Periodic table

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

Click on above elements (in Periodic table) to see their information or Visit Interactive Periodic Table (which shows names, symbol, atomic mass, electron configuration, electrons arrangement, etc. of all the elements)

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Why is Fermium in Period 7?

Why is Fermium in Period 7

Let me ask you a question.

How many shells does fermium have?

It’s 7. Right?

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

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

Why is Fermium in f-block?

Why is Fermium 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 fermium is [Rn] 5f12 7s2.

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

Hence, fermium is the f-block element.

5 Interesting facts about Fermium

Interesting facts about fermium element are mentioned below.

  1. The name of the element “Fermium” came from the Italian physicist Enrico Fermi.
  2. Fermium element was identified by Albert Ghiorso and his team (in 1952) at Lawrence Berkeley National Laboratory, California.
  3. Fermium does not occur naturally, but it is artificially prepared in a nuclear reactor.
  4. Fermium has 20 isotopes and all those isotopes are radioactive.
  5. Out of all the isotopes of fermium, the isotope 257Fm is the longest lived isotope, which has a half-life of 100 days.

Properties of Fermium

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

Physical properties of Fermium

Physical properties of fermium are mentioned below.

  • The predicted crystal structure of fermium metal is FCC (i.e face centered cubic).
  • The atomic mass of most stable isotope of fermium (257Fm) is 257 u, and its predicted density is 9.7 g/cm3.
  • The calculated melting point of fermium metal is 1527 °C.

Chemical properties of Fermium

Chemical properties of fermium are mentioned below.

  • Fermium is a chemically toxic and radioactive metal.
  • The fermium exists as a Fe3+ ion in most of the solution. Hence its most common oxidation state in solutions is +3.
  • Just similar to other actinides, fermium also shows +2 oxidation state.
  • The electronic configuration  of  fermium is [Rn] 5f12 7s2, which indicates that it is a f-block element (this is because the last electron enters the f-orbital).

Uses of Fermium

Fermium is generally used in research work in chemistry. It has no commercial uses due to its radioactivity.

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References:
Chemical data: Wikipedia, Chemspider

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