Whitish
The compound formed between sodium and selenium is sodium selenide (Na2Se). It is an inorganic compound that consists of sodium cations (Na+) and selenide anions (Se2-). Sodium selenide is often used in chemical synthesis and as a precursor for other selenium-containing compounds.
Well Sodium Selenide has a formula of Na2Se. Let's take a look at their molecular massesMolecular Mass of Sodium = 22.99=> 2 Sodiums = 45.98gMolecular Mass of Selenide = 78.96=> The Total Molecular Mass is 45.98 + 78.96 = 124.94 g mol-1What does that figure mean?This is the amount of Sodium Selenide that is required to make a 1 mole solution of this substance in a litre of water.
Sodium selenide is a compound formed between sodium and selenium.
disodium monoselenide
The chemical formula for sodium selenide is Na2Se.
The chemical formula of the compound formed when sodium reacts with selenium is Na2Se. This compound is called sodium selenide.
Copper (I) Selenide by the stock system or Cupprous Selenide by the latin system.
lead (IV) selenide
A selenide contain the anion Se(2-).
titanium (II) selenide = SeTi
Thallium(III) Selenide
The systematic name of this ionic compound is Tin(IV) Selenide.