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Lawrencium (Lr) – Element 103 of the periodic table

Lawrencium (symbol Lr) is element number 103 of the periodic table and belongs to the “Actinide” category. Its atomic mass is about 262, 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, 32, 8, 3. The short electron configuration of Lawrencium is [Rn] 5f¹⁴ 7s² 7p¹. Known uses of Lawrencium include Scientific research.

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

Properties of Lawrencium

Atomic number
103
Chemical symbol
Lr
Atomic mass
262
Category
Actinide
Period
7
Block
f
Phase
Solid
Protons
103
Electrons
103
Neutrons (approx.)
159
Electron shells
2, 8, 18, 32, 32, 8, 3
Outer-shell electrons
3
Discovered
Albert Ghiorso (1961)

Electron configuration of Lawrencium

The electron configuration of Lawrencium (Lr), with 103 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 5f¹⁴ 6s² 6p⁶ 7s² 7p¹
Short configuration
[Rn] 5f¹⁴ 7s² 7p¹
Last shell
7s² 7p¹

What is electron configuration and how is it written?

Electron shells of Lawrencium

Distribution of 103 electrons of Lawrencium across shells K to Q:

  1. K2
  2. L8
  3. M18
  4. N32
  5. O32
  6. P8
  7. Q3

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 Lawrencium

Frequently asked questions about Lawrencium

What is the atomic number of Lawrencium?

The atomic number of Lawrencium (Lr) is 103; that is, every atom of it has 103 protons.

What is the electron configuration of Lawrencium?

The electron configuration of Lawrencium (Lr) is 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰ 4f¹⁴ 5s² 5p⁶ 5d¹⁰ 5f¹⁴ 6s² 6p⁶ 7s² 7p¹; in short form it is [Rn] 5f¹⁴ 7s² 7p¹, and its last shell is 7s² 7p¹.

What is the chemical symbol of Lawrencium?

The chemical symbol of Lawrencium is Lr.

Where is Lawrencium located in the periodic table?

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

What is the atomic mass of Lawrencium?

The atomic mass of Lawrencium is about 262 (atomic mass units).

What is the phase of Lawrencium under normal conditions?

The phase of Lawrencium under standard conditions is Solid.

What are the uses of Lawrencium?

Uses of Lawrencium include Scientific research.

Who discovered Lawrencium?

Lawrencium was discovered by Albert Ghiorso in 1961.

Elements in the same category as Lawrencium (Actinide)

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

See all Actinides