WebElements Periodic Table » Selenium » selenium difluoride (2024)

FAQs

What is the chemical formula for selenium difluoride? ›

The table shows element percentages for SeF₂ (selenium difluoride).

Selenium is a chemical element; it has the symbol Se and atomic number 34. It is a nonmetal (more rarely considered a metalloid) with properties that are intermediate between the elements above and below in the periodic table, sulfur and tellurium, and also has similarities to arsenic.

Selenium is a chemical element with symbol Se and atomic number 34. Classified as a nonmetal, Selenium is a solid at room temperature.

selenium (Se), a chemical element in the oxygen group (Group 16 [VIa] of the periodic table), closely allied in chemical and physical properties with the elements sulfur and tellurium.

Selenium is used to make pigments for ceramics, paint and plastics. Selenium has both a photovoltaic action (converts light to electricity) and a photoconductive action (electrical resistance decreases with increased illumination). It is therefore useful in photocells, solar cells and photocopiers.

After 118, however, things stalled again. Fusion requires several milligrams of the target element, and producing enough einsteinium (element 99) to make element 119 is impossible with today's technology.

Why is there no element 57? ›

Meanwhile lanthanum, element 57, which really is a rare earth, is drawn separately from all the rest! This is especially ironic because those rare earths are called 'lanthanoids' or 'lanthanides'. Similarly, element 89 is next to element 104, instead of the element that should be there: element 103.

Didymium (Di) was removed from the periodic table. It was discovered by Carl Mosander in 1841 and was included in the first edition of Mendeleev's periodic table of chemical elements in 1869. Ether was never included on the periodic table because it's not an element.

Selenium is an essential mineral that is naturally present in many foods and added to others. It is also available as a dietary supplement.

Protein foods from animals are generally good sources of selenium. Seafood, organ meats, and Brazil nuts are the foods highest in selenium although Americans obtain most of their selenium from everyday staples, like breads, cereals, poultry, red meat, and eggs.

To prevent deficiency, the amount is based on normal daily recommended intakes: Adult and teenage males—40 to 70 micrograms (mcg) per day. Adult and teenage females—45 to 55 mcg per day. Pregnant females—65 mcg per day.

Tellurium dibromide | TeBr2 | CID 12120249 - PubChem.