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an Ionic compound
Calcium selenide, CaSe, is formed.
FeSe
Barium Selenide ---> Ba2+Se2- ---> BaSe
chlorine is more reactive than selenium. Chlorine needs one electron to form octet whereas selenium needs two.
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.
an Ionic compound
Calcium selenide, CaSe, is formed.
The ionic compound formed between magnesium and chlorine has the formula MgCl2.
The compound formed between rubidium and chlorine has the formula RbCl.
FeSe
Na2Se
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.
Barium Selenide ---> Ba2+Se2- ---> BaSe
Ordinary salt is a compound formed from sodium and chlorine.
Sodium chloride, an ionic compound, is formed.