Freezing /Melting Point: 217.0 °C (422.6 °F)

I have found this on Wikipedia.com... Jons Jakob Berzelius founded Selenium associated with Tellerium in 1817. I sure hope this helps!!!

Se-80 is the most common isotope.

Yes it can.

6.023 x 1023 atoms of selenium will weigh 78.96 g

So, 5.56 x 1024 atoms of selenium will weigh 728.9 g

Sulfur is a yellow nonmetal solid . Sulfur is in the OXYGEN GROUP !

The short answer is yes, usually. If you are working with an ultra high voltage stack all bets are off. For old stereos, etc. you need to estimate the peak reverse voltage and the current requirements. If you have documentation, use it, otherwise: rule 1. PIV is 30 volts per plate, divided by the formfactor: rule 1a. Formfactors: diode=1, half bridge (center tap)=2, bridge=4. rule 1b. Use the maximum of the above and the input electrolitic working voltage multiplied by 1.4, then round up to the next standard voltage within reason (silicon is cheap). rule 2. Assume 500mA per square inch of a single plate's area. rule 3. You may need to heatsink the new rectifier, especially if the current is over a few hundred mA. rule 4. Replace the electrolitics!!!! If the unit is old enough to have a selenium, they are well past the warentee. rule 5. If the voltage is low (under 10VDC) you may need to put a small valued resistor between the rectifier and capacitor. example: a 12 plate center tapped rectifier 1.5 inches square; 12*30=360V divide by 2 =180PIV area=2.25 square inches which gives a current requirement of a little over one amp so use a 1.5A 200PIV unit.

An excess of selenium in human body (selenosis) is a cause of hair loss. Other persons consider selenium beneficial for hair growth ! There is something wrong with these views.

KClO3 - KCl + O2

No. the current formulation does not include selenium sulfide

Sulfurs noble gas core electronic configuration is [Ne]3s2 3p4

Melting point (of gray selenium) 217°C

Boiling point (gray) 684.9°C

Selenium is not soluble in water. Like sulfur, though, it does dissolve in a rather nasty liquid called carbon disulfide, and in toluene, also called methyl benzene, and some of its relatives. All these liquids require handling in a fume cupboard and with precautions to stop their catching fire.

Se-2 ion or selenide ion is the most common.

If you mean the elements in their normal forms, F and Cl are gases, Br is a liquid, I is a solid.

If you mean their ligand hard/soft qualities as halide ions:-

the lighter ones are hard, Br- and I- soft

Selenium dioxide is most commonly used in the laboratory during a Riley Oxidation of paraldehyde to give glyoxal. It is also used in allylic oxidation.

Calcium selenide, CaSe, is formed.

It is normally solid. It melts at 221oC.

Selenium is reactive.

Selenium is a non metal element. Atomic number of it is 34.

First a special selenium coated, flat metal plate is positively charged. Light stones through a lens then projects an image of the page to be copied onto the charged plate. Whenever the light falls on the selenium plate the plate becomes a conductor and the positive charge is conducted away from the selenium by the metal plate.