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Terbium (Tb) – Element 65 of the periodic table

Terbium (symbol Tb) is element number 65 of the periodic table and belongs to the “Lanthanide” category. Its atomic mass is about 158.93, and its phase under standard conditions is Solid. This element sits in period 6 and the f-block (Lanthanides) of the periodic table, and its electrons are arranged in shells of 2, 8, 18, 27, 8, 2. The short electron configuration of Terbium is [Xe] 4f⁹ 6s². Known uses of Terbium include Green phosphors, Fuel cells and Magnetic alloys.

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Properties of Terbium

Atomic number
65
Chemical symbol
Tb
Atomic mass
158.93
Category
Lanthanide
Period
6
Block
f
Phase
Solid
Protons
65
Electrons
65
Neutrons (approx.)
94
Electron shells
2, 8, 18, 27, 8, 2
Outer-shell electrons
2
Discovered
Carl Gustaf Mosander (1843)

Electron configuration of Terbium

The electron configuration of Terbium (Tb), with 65 electrons, is shown below. The last shell (shell 6) is highlighted:

Full configuration
1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰ 4f⁹ 5s² 5p⁶ 6s²
Short configuration
[Xe] 4f⁹ 6s²
Last shell
6s²

What is electron configuration and how is it written?

Electron shells of Terbium

Distribution of 65 electrons of Terbium across shells K to P:

  1. K2
  2. L8
  3. M18
  4. N27
  5. O8
  6. P2

What is a lanthanide?

The lanthanides are the 15 elements from lanthanum to lutetium, part of the f-block, with very similar chemical properties; they are often grouped among the “rare earths”.

Uses of Terbium

Frequently asked questions about Terbium

What is the atomic number of Terbium?

The atomic number of Terbium (Tb) is 65; that is, every atom of it has 65 protons.

What is the electron configuration of Terbium?

The electron configuration of Terbium (Tb) is 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰ 4f⁹ 5s² 5p⁶ 6s²; in short form it is [Xe] 4f⁹ 6s², and its last shell is 6s².

What is the chemical symbol of Terbium?

The chemical symbol of Terbium is Tb.

Where is Terbium located in the periodic table?

Terbium is located in period 6 and the f-block (Lanthanides) and belongs to the “Lanthanide” category.

What is the atomic mass of Terbium?

The atomic mass of Terbium is about 158.93 (atomic mass units).

What is the phase of Terbium under normal conditions?

The phase of Terbium under standard conditions is Solid.

What are the uses of Terbium?

Uses of Terbium include Green phosphors, Fuel cells and Magnetic alloys.

Who discovered Terbium?

Terbium was discovered by Carl Gustaf Mosander in 1843.

Elements in the same category as Terbium (Lanthanide)

Lanthanum (La)Cerium (Ce)Praseodymium (Pr)Neodymium (Nd)Promethium (Pm)Samarium (Sm)Europium (Eu)Gadolinium (Gd)Dysprosium (Dy)Holmium (Ho)Erbium (Er)Thulium (Tm)Ytterbium (Yb)Lutetium (Lu)

See all Lanthanides