Curium (Cm) – Periodic Table (Element Information & More)

Curium (Cu) element Periodic table

This is a SUPER easy guide on Curium element.

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

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

Let’s dive right into it!

Curium Element (Cm) Information

AppearanceSilvery metallic appearance
State (at STP)Solid
Position in Periodic tablecurium in periodic table (Position)
Group: actinides, Period: 7, Block: f
Categorycurium element category
Inner transition metals
Atomic number or 
Protons		96
Neutrons151
Electrons96
SymbolCm
Atomic mass of Curium (most stable isotope) Curium (Cm) atomic mass
247 u
Electrons arrangement

or 

Bohr model		Bohr model of curium (Electrons arrangement in curium, Cm)
2, 8, 18, 32, 25, 9, 2
Electronic configuration[Rn] 5f7 6d1 7s2
Atomic radiusCurium (Cm) atomic radius
245 picometers (van der Waals radius)
1st Ionization energy6.02 eV
Electronegativity Electronegativity of curium (Cm)
1.3 (Pauling scale)
Crystal structurecrystal structure of curium
Double hexagonal close packed
Melting point1613 K or 1340 °C or 2444 °F
Boiling point3383 K or 3110 °C or 5630 °F
Density13.51 g/cm3
Main isotopes243Cm and 248Cm
Who discovered Curium and when?Glenn T. Seaborg, Albert Ghiorso and Ralph A. James (in 1944)
CAS number7440-51-9

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Curium in Periodic table

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

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Why is Curium in Period 7?

Why is Curium in Period 7

Let me ask you a question.

How many shells does curium have?

It’s 7. Right?

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

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

Why is Curium in f-block?

Why is Curium 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 curium is [Rn] 5f7 6d1 7s2.

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

Hence, curium is the f-block element.

5 Interesting facts about Curium

Interesting facts about curium element are mentioned below.

  1. The name of the element “Curium” was named after the well known chemists Marie Curie and Pierre Curie.
  2. Curium was discovered by Glenn T. Seaborg, Albert Ghiorso and Ralph A. James in 1944.
  3. Curium is prepared synthetically in the laboratory, but it also occurs naturally in trace amounts in uranium containing ores.
  4. Curium has around 19 isotopes, and all these isotopes are radioactive in nature.
  5. The most stable isotope of curium is 247Cm, which has a half-life of 15.6 million years.

Properties of Curium

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

Physical properties of Curium

Physical properties of curium are mentioned below.

  • Curium metal is solid in state at room temperature and it has a silvery white metallic luster.
  • Curium is a dense metal and its melting point is 1340 °C which is higher than its preceding transuranic elements neptunium, plutonium, and americium.
  • At room temperature, the crystal structure of curium is DHCP (double hexagonal close packed) and at higher temperature, its crystal structure changes to face centered cubic.
  • The predicted atomic mass of the most stable isotope of curium is 247 u and its density is 13.51 g/cm3.

Chemical properties of Curium

Chemical properties of curium are mentioned below.

  • Curium is a chemically reactive metal which oxides in the air when kept open. Due to the oxidation of curium, it forms a thin oxide layer on it.
  • Curium is a radioactive element and it is dangerous for the human body as its radiation destroys the red blood cell formation in the bone marrow.
  • Curium ions show +3 oxidation state in solutions, and it shows +4 oxidation states in its solid compounds.

Uses of Curium

The uses of curium are mentioned below.

  • Due to the radioactive nature of curium element, it is mainly used for research work.
  • Curium can be used in radioisotope thermoelectric generators that are used in spacecraft.
  • 244Cm is the isotope which was used in X-ray spectrometers to measure the abundance of chemical elements in the rocks and soils on Mars.

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External resources:

  1. Curium – Element information, properties and uses | Periodic Table. (n.d.). Curium – Element Information, Properties and Uses | Periodic Table. https://www.rsc.org/periodic-table/element/96/curium
  2. It’s Elemental – The Element Curium. (n.d.). It’s Elemental – the Element Curium. https://education.jlab.org/itselemental/ele096.html
  3. P. (n.d.). Curium | Cm (Element) – PubChem. Curium | Cm (Element) – PubChem. https://pubchem.ncbi.nlm.nih.gov/element/Curium
  4. Curium – Wikipedia. (2008, December 7). Curium – Wikipedia. https://en.wikipedia.org/wiki/Curium
  5. Curium. (n.d.). Curium. https://www.cs.mcgill.ca/~rwest/wikispeedia/wpcd/wp/c/Curium.htm
  6. C&EN: IT’S ELEMENTAL: THE PERIODIC TABLE – CURIUM. (n.d.). C&EN: IT’S ELEMENTAL: THE PERIODIC TABLE – CURIUM. https://pubsapp.acs.org/cen/80th/curium.html?
  7. Periodic Table of Nottingham – University of Nottingham. (n.d.). Periodic Table of Nottingham – University of Nottingham. https://www.nottingham.ac.uk/periodicnottingham/curium

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    Jay holds the roles of an author and editor at Periodic Table Guide, leveraging his ability to provide clear explanations on typically unexciting topics related to periodic table. He is passionate to help student, and he finds immense joy in his endeavors to make learning enjoyable and accessible. You can connect with him on facebook and twitter.

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