Dubnium (Db)

Science / Periodic Table of Elements / Dubnium (Db): Atomic number: 105, Atomic mass: 261.9 g.mol -1, Electronegativity: unknown, Density: unknown, Melting point: unknown, Boiling point: unknown, Vanderwaals radius: unknown, Ionic radius: unknown, Isotopes: 1, Discovered: Albert Ghiorso in 1970. The atomic weight of nine known isotopes range from 255 to 263; the longest-lived isotope, dubnium 268 has an half-life of 32 hours. Applications: Dubnium does not have any application and little is known about it. Dubnium in the environment: Dubnium is not found free in the environment, it is a synthetic element. Health effects of dubnium: As it is so unstable, any amount formed would decompose to other elements so quickly that there’s no reason to study its effects on human health. Environmental effects of dubnium: Due to its extremely short half-life (about 34 seconds), there’s no reason for considering the effects of dubnium in the environment.

Dubnium (Db)

Science / Periodic Table of Elements / Dubnium (Db): Atomic number: 105, Atomic mass: 261.9 g.mol -1, Electronegativity: unknown, Density: unknown, Melting point: unknown, Boiling point: unknown, Vanderwaals radius: unknown, Ionic radius: unknown, Isoto MORE

Defensive Back (DB)

Entertainment / Football / Defensive Back (DB): A cornerback or safety position on the defensive team; commonly defends against wide receivers on passing plays. Generally there are 4 defensive backs playing at a time. MORE

Decibel (dB)

Technology / Cell Phones / Decibel (dB): A unit of measure used to express relative difference in power or intensity of sound. MORE

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