The manganese(IV) selenide has the chemical formula MnSe2.
Sodium selenide is a compound formed between sodium and selenium.
That would be chromium(IV) selenide with the formula CrSe2
Because in a chemical compound is a chemical bond between the elements. From a mixture of iron and sulfur iron can be separated with a magnet.
For example the chemical reactivity.
Any relation between carbon dioxide and these chemical elements.
FeSe
Sodium selenide is a compound formed between sodium and selenium.
The compound formed between sodium and selenium is named "sodium selenide" and has the formula Na2Se.
That would be chromium(IV) selenide with the formula CrSe2
The formula would be K2Se
an Ionic compound
Type of bonding between elements in a compound chemical-chemically is chemical bonding.
the difference is that the formula does not have the same categories as the chemical compound does
A difference of quality; the pure chemical compound is a refined compound, having a very low concentration of impurities.
Because in a chemical compound is a chemical bond between the elements. From a mixture of iron and sulfur iron can be separated with a magnet.
For example the chemical reactivity.
It doesn't seem likely. Selenium isn't terribly reactive, and selenium monochloride exists in equilibrium with a different kind of selenium chloride, chlorine gas, and elemental selenium; this indicates that there's not a huge energy difference between the uncombined elements and the compound, as you would expect there to be if they "blew up" when combined.