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Curium (Cm) – Element 96 of the periodic table

Curium (symbol Cm) is element number 96 of the periodic table and belongs to the “Actinide” category. Its atomic mass is about 247, and its phase under standard conditions is Solid. This element sits in period 7 and the f-block (Actinides) of the periodic table, and its electrons are arranged in shells of 2, 8, 18, 32, 25, 9, 2. The short electron configuration of Curium is [Rn] 5f⁷ 6d¹ 7s². Known uses of Curium include Space power source, Radiation therapy and Scientific research.

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Curium is a radioactive, mostly synthetic element; its data may be based on limited experiments or theoretical prediction.

Properties of Curium

Atomic number
96
Chemical symbol
Cm
Atomic mass
247
Category
Actinide
Period
7
Block
f
Phase
Solid
Protons
96
Electrons
96
Neutrons (approx.)
151
Electron shells
2, 8, 18, 32, 25, 9, 2
Outer-shell electrons
2
Discovered
Glenn Seaborg (1944)

Electron configuration of Curium

The electron configuration of Curium (Cm), with 96 electrons, is shown below. The last shell (shell 7) is highlighted:

Full configuration
1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰ 4f¹⁴ 5s² 5p⁶ 5d¹⁰ 5f⁷ 6s² 6p⁶ 6d¹ 7s²
Short configuration
[Rn] 5f⁷ 6d¹ 7s²
Last shell
7s²

What is electron configuration and how is it written?

Electron shells of Curium

Distribution of 96 electrons of Curium across shells K to Q:

  1. K2
  2. L8
  3. M18
  4. N32
  5. O25
  6. P9
  7. Q2

What is a actinide?

The actinides are the 15 elements from actinium to lawrencium, part of the f-block, and all of them are radioactive.

Uses of Curium

Frequently asked questions about Curium

What is the atomic number of Curium?

The atomic number of Curium (Cm) is 96; that is, every atom of it has 96 protons.

What is the electron configuration of Curium?

The electron configuration of Curium (Cm) is 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰ 4f¹⁴ 5s² 5p⁶ 5d¹⁰ 5f⁷ 6s² 6p⁶ 6d¹ 7s²; in short form it is [Rn] 5f⁷ 6d¹ 7s², and its last shell is 7s².

What is the chemical symbol of Curium?

The chemical symbol of Curium is Cm.

Where is Curium located in the periodic table?

Curium is located in period 7 and the f-block (Actinides) and belongs to the “Actinide” category.

What is the atomic mass of Curium?

The atomic mass of Curium is about 247 (atomic mass units).

What is the phase of Curium under normal conditions?

The phase of Curium under standard conditions is Solid.

What are the uses of Curium?

Uses of Curium include Space power source, Radiation therapy and Scientific research.

Who discovered Curium?

Curium was discovered by Glenn Seaborg in 1944.

Elements in the same category as Curium (Actinide)

Actinium (Ac)Thorium (Th)Protactinium (Pa)Uranium (U)Neptunium (Np)Plutonium (Pu)Americium (Am)Berkelium (Bk)Californium (Cf)Einsteinium (Es)Fermium (Fm)Mendelevium (Md)Nobelium (No)Lawrencium (Lr)

See all Actinides