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Se - Selenium Selenium was discovered by J. J. Berzelius in 1817 in Sweden.
Atomic number - 34 Density g/mL 4 .8
Atomic weight u 78 .96 Melting point K 494
Bonding radius A 1 .16 Boiling point K 958
Atomic radius A 1 .22 Heat of vaporization kJ/mol 37 .7
Ionization Potential V 9 .752 Heat of fusion kJ/mol 6 .694
Electronegativity - 2 .55 Specific heat J/gK 0 .32
The oxide is a strong acid.
Crystal are hexagonal.
Electron config. : [Ar] 3d10 4s2 4p4
Definition: An element that closely resembles sulphur in its properties. The main use in steel is as a freecutting additive but due to high cost its use is limited to stainless steel. One of the benefits being the ability to obtain a very good surface finish on machined components.
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Selenium: Selenium |
Selenium is a test tool for web applications. Selenium tests run directly in a
browser, just as real users do. And they run in Internet Explorer, ...
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28-Dec-2005 Hits: 189 Rating: 0.00 Votes: 0
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Automate acceptance tests with Selenium |
Acceptance, or functional, testing is designed to put manual tasks through their paces, but testing these tasks by hand can be time consuming and prone to ...
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28-Dec-2005 Hits: 167 Rating: 0.00 Votes: 0
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