95 Am Americium 243,0 u

Americium

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Période
7
Groupe
—
Bloc
f-bloc
Phase (STP)
Solid

Americium is a synthetic radioactive element found in household smoke detectors. Am-241 emits alpha particles that ionize air for smoke detection.

About Americium

Millions of household smoke detectors contain a fraction of a gram of americium, making this synthetic actinide one of the few artificially produced elements in routine domestic use. Its atomic number is 95 and its relative atomic mass 243.0, with the configuration [Rn] 5f7 7s2 marking a half-filled 5f subshell, and its electronegativity is 1.3. The metal is solid under standard conditions. The detector application rests on a specific decay mode: americium-241 emits alpha particles that ionise the air inside a small chamber, producing a steady current that smoke particles interrupt. Because the alpha radiation is stopped by a short distance of air, the sealed source presents little hazard while the device remains intact.

Propriétés physiques

Masse atomique 243.0 u
Phase à STP Solid

Propriétés électroniques

Électronégativité 1.3

Configuration électronique

Configuration [Rn] 5f⁷ 7s²

Electron Shell Configuration

Americium electron shell configuration Am 2e⁻ 8e⁻ 18e⁻ 32e⁻ 25e⁻ 8e⁻ 2e⁻
Electron shell structure of Americium — electrons per shell.
Shell Electrons
1 (K) 2
2 (L) 8
3 (M) 18
4 (N) 32
5 (O) 25
6 (P) 8
7 (Q) 2

Position in Periodic Table

Americium position in the periodic table Am

Bloc et période

Bloc

s p d f

Période

1 2 3 4 5 6 7

Tableau périodique

Lanthanides Actinides

Réactions impliquant Am

Americium-241 Alpha Decay

²⁴¹Am → ²³⁷Np + ⁴He

Nuclear

Plus de Actinide

89 Ac Actinium 90 Th Thorium 91 Pa Protactinium 92 U Uranium 93 Np Neptunium 94 Pu Plutonium 96 Cm Curium 97 Bk Berkelium 98 Cf Californium 99 Es Einsteinium

Frequently Asked Questions

What is Americium?
Americium (Am) is a chemical element with atomic number 95. It is a solid at standard temperature and pressure, classified as a actinide.
What are the key properties of Americium?
Americium has an atomic mass of 243.0 u.
What is the electron configuration of Americium?
The electron configuration of Americium is [Rn] 5f7 7s2. It is in the f-block of the periodic table.
What is the electronegativity of Americium?
Americium has an electronegativity of 1.3 on the Pauling scale.