The Elements - Periodic Table

Thallium For insecticides. Atomic Number: 81 Atomic Symbol: Tl Atomic Weight: 204.37 Electron Configuration:[Xe]6s^2 4f^14 5d^10 ...

Handling The element and its compounds are toxic and should be handled carefully. Contact of the metal with skin is dangerous, a ...

Bismuth For fuses. Atomic Number: 83 Atomic Symbol: Bi Atomic Weight: 208.9804 Electron Configuration:[Xe]6s^2 4f^14 5d^10 6p^3 ...

for U235 or U233 fuel in nuclear reactors. Its soluble salts are characterized by forming unsoluble basic salts on the addition ...

Polonium For nuclear batteries. Atomic Number: 84 Atomic Symbol: Po Atomic Weight: 209 Electron Configuration:[Xe]6s^2 4f^14 5d^ ...

Uses Because almost all alpha radiation is stopped within the solid source and its container, giving up its energy, polonium has ...

Astatine Seldom found in nature. Atomic Number: 85 Atomic Symbol: At Atomic Weight: 210 Electron Configuration:[Xe]6s^2 4f^14 5d ...

Sources: CRC Handbook of Chemistry and Physics and the American Chemical Society. Last Updated: 12/19/97, CST Information Servic ...

Radon For earthquake prediction. Atomic Number: 86 Atomic Symbol: Rn Atomic Weight: 222 Electron Configuration:[Xe]6s^2 4f^14 5d ...

practice has been largely discontinued as hospitals can get the seeds directly from suppliers, who make up the seeds with the de ...

Francium Seldom found in nature. Atomic Number: 87 Atomic Symbol: Fr Atomic Weight: 223 Electron Configuration:[Rn]7s^1 History ...

Radium For glow in the dark paint. Atomic Number: 88 Atomic Symbol: Ra Atomic Weight: 226.0254 Electron Configuration: [Rn]7s^2 ...

Uses One gram of radium produces about 0.0001 ml (stp) of emanation, or radon gas, per day. This is purged from the radium and s ...

Actinium Neutron source. Atomic Number: 89 Atomic Symbol: Ac Atomic Weight: 227 Electron Configuration:[Rn]7s^2 6d^1 History (Gr ...

Rutherfordium Proposed name Atomic Number: 104 Atomic Symbol: Rf / Ku Atomic Weight: 261 Electron Configuration:[Rn]7s^2 5f^14 6 ...

decaying by emitting an alpha particle into 253No, with a half-life of 105 s. The same reaction, except with the emission of thr ...

Dubnium Proposed Name Atomic Number: 105 Atomic Symbol: Db Atomic Weight: 262 Electron Configuration:[Rn]7s^2 5f^14 6d^3 History ...

Isotopes In October 1971, it was announced that two new isotopes of element 105 were synthesized with the heavy ion linear accel ...

Sg Seaborgium Proposed Name Atomic Number: 106 Atomic Symbol: Sg Atomic Weight: 263 Electron Configuration:[Rn]7s^2 5f^14 6d^4 H ...

Nobelium Atomic Number: 102 Atomic Symbol: No Atomic Weight: 259 Electron Configuration:[Rn]7s^2 5f^14 History (Alfred Nobel, di ...