The correct formula is H2Se.
Because it is an acid, hydrogen needs to be at the beginning. Hydrogen has an ionization of +1 and selenium (from which you get selenic) has -2, so you'll need 2 atoms of hydrogen (H) to balance out 1 atom of selenium (Se). So you'll have H2Se.
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.
Almost certainly you are looking for Titanium(IV) Selenide, TiSe2, though the Titanium(III) compound, Ti2Se3 may exist as well. You should be more specific :)
zinc selenide
The empirical formula of phosphorus selenide is P2Se3.
disodium monoselenide
The formula for scandium III selenide is Sc2Se3. This compound consists of two scandium ions (Sc3+) and three selenide ions (Se2-).
The binary ionic compound name for Li2Se is lithium selenide.
K2Se is potassium selenide or more precisely dipotassium selenide. As for KSe that probably doesn't exist, if it did it would be monopotassium selenide
The formula for gallium selenide is Ga2Se3. This compound is formed by the combination of two gallium atoms with three selenium atoms.
The formula for cobalt(II) selenide is CoSe. It is composed of one cobalt ion (Co^2+) and one selenide ion (Se^2-).
The correct formula is K2Se. It is an ionic compound: potassium selenide.
Ca+2 Se-2 -----> these are the ions and their chargesCalcium selenide (CaSe)-------> the charges must equal zero; since they already do, there is one ion of each in the compound.
The chemical formula for silver selenide is Ag₂Se. It is composed of two atoms of silver (Ag) and one atom of selenium (Se) in the compound.
Calcium selenide, CaSe, is formed.
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.
Sulfur and phosphorus would most like form the compound P2S5
The chemical formula of the compound formed when sodium reacts with selenium is Na2Se. This compound is called sodium selenide.