Plutonium (pronounced /pluːˈtoʊniəm/ ploo-TOH-nee-əm, symbol Pu, atomic number 94) is a rare transuranic radioactive element. It is an actinide metal of silvery-white appearance that tarnishes when exposed to air, forming a dull coating when oxidized. The element normally exhibits six allotropes and four oxidation states. It reacts with carbon, halogens, nitrogen and silicon. When exposed to moist air, it forms oxides and hydrides that expand the...
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Plutonium
Chemical Element
The 94th Element in the Periodic Table
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Neptunium
Neptunium (pronounced /nɛpˈtjuːniəm/, nep-TEW-nee-əm) is a chemical element with the symbol Np and atomic number 93. A radioactive metallic element,...
Symbol:
- Pu
Atomic mass:
- 244 u (4.05E-16 µg )
Electrons per shell:
- 2,8,18,32,24,8,2
Electronegativity (Pauling scale):
- 1.28
Atomic radius:
- 175 pm (0.00000689 )
Van der Waals radius:
- 200 pm (0.00000787 )
Isotopes:
- Plutonium-239
- Plutonium-241
- Plutonium-244
- Plutonium-238
- Plutonium-240
- Plutonium-243
- Plutonium-235
- Plutonium-246
- Plutonium-232
- Plutonium-237
Melting Point:
- 639.85 °C (1183.7 °F )
Boiling Point:
- 3,231.85 °C (5849.39 °F )
Periodic table block:
Ionization Energy:
- 6.026 eV (0.000006026 MeV )
Discovery Date:
- 1940
Electron Configuration:
- Rn 5f6 7s2