Se2- is incorrect the answer is As 3-
A selenide contain the anion Se(2-).
The symbol for this ion is As3-. The charge is 3- because there are three more electrons than protons.
The oxidation states of selenium are: -2, +2, +4, +6.
Selenium typically gains two electrons to achieve a stable electron configuration, forming the Se2- ion. Arsenic typically loses three electrons to achieve a Noble Gas electron configuration and forms the As3+ ion.
Arsenic becomes an ion by gaining or losing electrons. It can either gain three electrons to form the As3- ion (arsenide ion) or lose three electrons to form the As3+ ion (arsenite ion), depending on the reaction conditions.
A selenide contain the anion Se(2-).
The ion formed by an arsenic atom is As3- (arsenide ion) when it gains three electrons or As3+ (arsenite ion) when it loses three electrons.
The symbol for this ion is As3-. The charge is 3- because there are three more electrons than protons.
The symbol for an arsenic ion is As3+.
When selenium gains two electrons, it becomes the selenide ion.
The oxidation states of selenium are: -2, +2, +4, +6.
Selenium typically gains two electrons to achieve a stable electron configuration, forming the Se2- ion. Arsenic typically loses three electrons to achieve a Noble Gas electron configuration and forms the As3+ ion.
Selenium typically forms an ion with a charge of -2 when it gains two electrons to achieve a stable electron configuration. This forms the selenide ion (Se2-).
Arsenic becomes an ion by gaining or losing electrons. It can either gain three electrons to form the As3- ion (arsenide ion) or lose three electrons to form the As3+ ion (arsenite ion), depending on the reaction conditions.
The correct order from smallest to largest ionic radius is chloride ion < sulfide ion < potassium ion < calcium ion.
Se2- 1s22s22p63s23p64s23d104p6
None. The Se2- ion is isoelectronic with Krypton.