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.
well your right they are in group 16 . but Br bromine wouldn't be because it has negative 1 charge and selenium has negative 2. But your right about krypton being isoelectronic with selenium.
1) The charge on the ion that Selenium forms in an ionic compound is typically -2. Selenium belongs to Group 16 (also known as Group VI A) of the periodic table, and it tends to gain two electrons to achieve a stable electron configuration, resulting in a charge of -2.
2) The noble gas that is isoelectronic with the Selenium ion (Se^2-) is Krypton (Kr). Isoelectronic species have the same number of electrons, and both the Se^2- ion and Krypton have 36 electrons.
3) Other ions that are isoelectronic with Krypton include Bromide (Br^-), Iodide (I^-), Rubidium (Rb^+), and Strontium (Sr^2+). These ions all have 36 electrons, the same as Krypton.
1) To determine the charge on the ion that Selenium forms in an ionic compound, you can refer to the periodic table. Selenium is located in Group 16, also known as Group VIA or Group 6A. Elements in this group typically form ions with a charge of -2 when they combine with other elements in ionic compounds. Therefore, Selenium typically forms a -2 charge ion in an ionic compound. This means that it gains two electrons when it forms an ion.
2) To find the noble gas that is isoelectronic with an ion, you need to refer to the electron configuration of the ion. In the case of Selenium forming a -2 charge ion, the electron configuration is [Kr]4d^105s^25p^6. To find the noble gas that has the same number of electrons, you need to look for a noble gas with the electron configuration 1s^22s^22p^63s^23p^64s^23d^10 4p^6. The noble gas that matches this electron configuration is Krypton (Kr), as you correctly mentioned.
3) Once you have determined that Krypton is isoelectronic with Selenium's ion, to find other ions that are isoelectronic with Kr, you need to look for ions with the same electron configuration as Kr. Some ions that are isoelectronic with Krypton include Br^- (Bromide ion), Rb^+ (Rubidium ion), Sr^2+ (Strontium ion), Y^3+ (Yttrium ion), Zr^4+ (Zirconium ion), and Nb^5+ (Niobium ion). These ions all have the electron configuration [Kr]4d^105s^25p^6.
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.