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Americium (Am) – Element 95 of the periodic table

Americium (symbol Am) is element number 95 of the periodic table and belongs to the “Actinide” category. Its atomic mass is about 243, 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, 8, 2. The short electron configuration of Americium is [Rn] 5f⁷ 7s². Known uses of Americium include Smoke detectors, Radiation therapy and Scientific research.

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

Properties of Americium

Atomic number
95
Chemical symbol
Am
Atomic mass
243
Category
Actinide
Period
7
Block
f
Phase
Solid
Protons
95
Electrons
95
Neutrons (approx.)
148
Electron shells
2, 8, 18, 32, 25, 8, 2
Outer-shell electrons
2
Discovered
Glenn Seaborg (1944)

Electron configuration of Americium

The electron configuration of Americium (Am), with 95 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 7s²
Short configuration
[Rn] 5f⁷ 7s²
Last shell
7s²

What is electron configuration and how is it written?

Electron shells of Americium

Distribution of 95 electrons of Americium across shells K to Q:

  1. K2
  2. L8
  3. M18
  4. N32
  5. O25
  6. P8
  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 Americium

Frequently asked questions about Americium

What is the atomic number of Americium?

The atomic number of Americium (Am) is 95; that is, every atom of it has 95 protons.

What is the electron configuration of Americium?

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

What is the chemical symbol of Americium?

The chemical symbol of Americium is Am.

Where is Americium located in the periodic table?

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

What is the atomic mass of Americium?

The atomic mass of Americium is about 243 (atomic mass units).

What is the phase of Americium under normal conditions?

The phase of Americium under standard conditions is Solid.

What are the uses of Americium?

Uses of Americium include Smoke detectors, Radiation therapy and Scientific research.

Who discovered Americium?

Americium was discovered by Glenn Seaborg in 1944.

Elements in the same category as Americium (Actinide)

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

See all Actinides