Americium (Am)

General Properties

Symbol Am
Atomic Number 95
Atomic Weight (243)
Group
(Actinoids)
Solid, Actinide, Radioactive, Synthetic
Period 7
Block f

Physical Properties

Density 13.7 g/cm3
Atomic Volume 20.8 cm3/mole
Atomic Radius 1.84 angstroms
Covalent Radius --
Crust Abundance None
Crystal Structure Hexagonal
Color Silver

States

Melting Point 994.0 °C
Boiling Point 2607.0 °C
Heat of Fusion --
Heat of Vaporization --

Energy

Electronegativity 1.3 (Pauling Scale)
Electron Affinity --
1st Ionization Energy 578 kJ/mol
Specific Heat Capacity J g−1 K−1
Thermal Conductivity 10.0 W·m−1·K−1

Electrons & Oxidation

Oxidation States +3,4,5,6
Electrons Per Shell 2 8 18 32 25 8 2
Electron Configuration [Rn] 5f7 7s2
1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s2 5p6 4f14 5d10 6s2 6p6 5f7 7s2
Orbital Diagram
1s
↿⇂
2s
↿⇂
2p
↿⇂
↿⇂
↿⇂
3s
↿⇂
3p
↿⇂
↿⇂
↿⇂
3d
↿⇂
↿⇂
↿⇂
↿⇂
↿⇂
4s
↿⇂
4p
↿⇂
↿⇂
↿⇂
4d
↿⇂
↿⇂
↿⇂
↿⇂
↿⇂
4f
↿⇂
↿⇂
↿⇂
↿⇂
↿⇂
↿⇂
↿⇂
5s
↿⇂
5p
↿⇂
↿⇂
↿⇂
5d
↿⇂
↿⇂
↿⇂
↿⇂
↿⇂
5f
↿ 
↿ 
↿ 
↿ 
↿ 
↿ 
↿ 
6s
↿⇂
6p
↿⇂
↿⇂
↿⇂
6d
 
 
 
 
 
6f
 
 
 
 
 
 
 
7s
↿⇂
7p
 
 
 
7d
 
 
 
 
 
7f
 
 
 
 
 
 
 

Nuclear

Radioactive Yes
Half Life 7388 y
Lifetime 1.065×104y
Decay Alpha Emission

Media

Planetary Bohr Model of Americium (Am)
Lewis Dot Diagram of Americium (Am)
Description
Silvery-white, artificially produced radioactive metal.
Uses
Americium-241 is currently used in smoke detectors.
Sources
Produced by bombarding plutonium with neutrons.
Pronounciation (English)
am-er-ISH-i-em

Translations

Afrikaans Amerikium
Aragonese Amerizio
العربية أمريكيوم
Armãneashte Ameritsiumu
asturianu Americiu
azərbaycan dili Amersium
български Америций
বাংলা অ্যামেরিসিয়াম
brezhoneg Amerikiom
bosanski Americij[um]
Byelorussian Амерыцый
Cebuano Amerisyo
čeština Americium
Chuvash Америци
Cymraeg Americi
dansk Americium
Deutsch Amerizium
Ελληνικά Αμερικιο
English Americium
esperanto Americio
español Amerício
eesti Ameriitsium
euskara Amerizioa
فارسی امریسیم
suomi Amerikium
føroyskt Americium
français Américium
furlan Americi
West-Frysk Americium
Gaeilge Aimeiriciam
Gàidhlig Aimeiriciam
galego Americio
ગુજરાતી ઍમરિશિયમનો
Gaelg Americium
Hakka Chinese Mî (鋂)
עברית אמריציום
हिन्दी अमेरिशियम
hrvatski Americij
magyar Amerícium
հայերեն Ամերիցիում
Indonesia Amerisium
íslenska Ameríkín
italiano Americio
日本語 アメリシウム
ქართული ამერიციუმი
کٲشُر Amerik
қазақ тілі Америций
한국어 아메리슘
Kurdish Amerikyûm
Komi Америций
kernewek Amerycanyum
кыргызча Америций
Latin Americium
Lëtzebuergesch Amerizium
Lombard Ameríci
lingála Amelu
lietuvių Americis
latviešu Amerīcijs
Mari Америций
Maori Americium
македонски Америциум
മലയാളം അമെരിസിയം
монгол Америци
Мокшан Америки
Bahasa Melayu Amerisium
Malti Amerizjum, ²Ameriċju
Nahuatl Americio
Nederlands Americium
norsk Americium
Occitan Americi
ирон Америций
polski Ameryk
português Amerício
Runasimi Amerisyu
română Americiu
русский Америций
slovenčina Americium
slovenščina Americij
Samoan Amerikimi
Samogitian Amerėcis
shqip Americ[iumi]
српски Америцијум
Southern Sotho Amerikiamo
svenska Americium
Kiswahili Ameriki
தமிழ் அமெரிகியம்
Tajik Америтсий
ไทย อะเมริเซียม
Türkçe Amerikyum
ئۇيغۇرچە ئامېرىتسىي
українська Америцій
o‘zbek Ameritsiy
Tiếng Việt Amerixi
Võro Ameriitsium
中文 鎇

History

Discovered In
1944
Discovered By
Glenn Seaborg, Ralph James., L. Morgan, Albert Ghiorso
Discovered At
USA
Word Origin
From the English word "America"