Elements
95

Am

Americium

Americium (Am) is a silvery colored radioactive metal that has the atomic number 95 in the periodic table. It is an Actinoid Metal with the symbol Am.

Americium was the fourth synthetic element to be discovered in 1944 by Seaborg, James and Morgan. The element plutonium was bombarded with neutrons in a reactor producing new elements which were hard to isolate. As it is located on the periodic table below Europium it is named after America. It is used in small amounts in smoke detectors as it produces radiation that is blocked by smoke. It is also used as as source of gamma and alpha rays in science. It is a solid metal at room temperature and it has a melting point of 1176°c and a boiling point of 2607°c.

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FAQ's

What is the Melting Point for Americium?

Americium has a Melting Point of 994°F, meaning at 994°F it will turn to a liquid.

What is the Boiling Point for Americium?

Americium has a Boiling Point of 2607°F, meaning at 2607°F it will turn to a Gas.

What is the Electronegativity of Americium?

Americium's Electronegativty is 1.3. Electronegativity is a measure of how strongly atoms attract bonding electrons to themselves.

What is the Heat of Vaporization of Americium?

Americium has a Heat of Vaporization of kJ/mol.

Uses

Americium-241 is currently used in smoke detectors.

Sources

Produced by bombarding plutonium with neutrons.

95
Protons
95
Electrons
148
Neutrons

Am

Element Symbol
Am
Atomic Weight
243
Atomic Number
95
State
Solid
Melting Point
Unknown
994
°C
Boiling Point
2607
Unknown
°C
Heat of Vaporization
Unknown
kJ/mol
Crystal Structure
Hexagonal
Thermoconductivity
0.1
Unknown
W/cmK
Shells
2,8,18,32,25,8,2
Group
Actinide
Period
7
Block
F Block
Orbitals
[Rn] 5f7 7s2
Coefficient of Thermal Expansion
7.1 10^-6 K^-1
Covalent Radius
--
Density at 293K
13.6 g/cm³
Electrical Conductivity
0.022 10^6/cm ohm
First Ionization Potential
5.993 V
Second Ionization Potential
--
Third Ionization Potential
--
Ionic Radius
--
Oxydation States
6,5,4,(3)
Lattice Parameter
3.4681 Å
Lattice Parameter 2
--
Lattice Parameter 3
--
Pronounced

am-er-ISH-i-em

Discovered by

G.T.Seaborg, R.A.James, L.O.Morgan, A.Ghiorso

Discovery date

1945

Orbital configuration
2,8,18,32,25,8,2

Download the Periodic Table

Explore Other Actinides

244
94

Pu

Plutonium
237
93

Np

Neptunium
257
100

Fm

Fermium
247
97

Bk

Berkelium
258
101

Md

Mendelevium
227
89

Ac

Actinium
252
99

Es

Einsteinium
262
103

Lr

Lawrencium
251
98

Cf

Californium
231.036
91

Pa

Protactinium
247
96

Cm

Curium
259
102

No

Nobelium
238.029
92

U

Uranium
232.038
90

Th

Thorium
The actinide series contains 15 metallic elements from number 89 (actinium) to 103 (lawrencium). They are located in group 3 in the periodic table.
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