Posted by Hannah on Wednesday, November 2, 2011 at 11:10am.
1) What is the charge on the ion that Selenium forms in an ionic compound?
I am not sure about this.
Look on the periodic table. Where is Se. It is in group 16(or group VIIA depending on the system you are using). So it is like O and S. That means it has six electrons in the outer shell so it want to gain two more electrons. That gives the ion a -2 charge. Oxygen behaves the same way. So does S.
2) What noble gas is isoelectronic with this ion.
I was thinking Krypton because it is a noble gas and it is the closest to Selenium but I am not sure.
Of course it's Kr
3) What other ions are isoelectronic with this noble gas?
I was thinking Bromine since again it is closest to Krypton.
Sure. Br^-(bromide), Se^2-(selenide), As^3- (arsenide)although As usually doesn't gain three electrons.
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