Chemistry

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1) What is the charge on the ion that Selenium forms in an ionic compound?
I am not sure about this.

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.

3) What other ions are isoelectronic with this noble gas?

I was thinking Bromine since again it is closest to Krypton.

  • Chemistry -

    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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