how do I find two positive ions and two negative ions that are isoelectronic with
a) Ar
b) Xe
Pick the element before (atomic number that is) and the element after Ar.
Do the same for Xe.
what is molarity of a solution by dissolving 10.0g of acetone, c3h6o, in enough water to make 125 ml of solution?
To find ions that are isoelectronic with a given atom or ion, you need to compare their electron configurations and identify ions with the same number of electrons. In this case, we are looking for ions that have the same number of electrons as the noble gases Argon (Ar) and Xenon (Xe).
a) Isoelectronic ions with Ar:
To determine the isoelectronic ions, we need to consider Argon's electron configuration, which is 1s2 2s2 2p6 3s2 3p6. This means Argon has 18 electrons.
To find positive ions that are isoelectronic with Ar, we need to remove electrons. Removing electrons results in cations (positive ions). Let's take away two electrons from Argon, resulting in the formation of the Ar+2 ion. The electron configuration of Ar+2 is 1s2 2s2 2p6 3s2 3p6, which is the same as neon (Ne). So, Ar+2 is isoelectronic with Ne.
To find negative ions that are isoelectronic with Ar, we need to add electrons. Adding two electrons results in the formation of anions (negative ions). In this case, adding two electrons to Argon gives Ar-2. The electron configuration of Ar-2 is 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6, which is identical to Krypton (Kr). Therefore, Ar-2 is isoelectronic with Kr.
b) Isoelectronic ions with Xe:
To find ions that are isoelectronic with Xenon, we need to consider its electron configuration, which is 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s2 5p6. This means Xenon has 54 electrons.
To find positive ions that are isoelectronic with Xe, we need to remove electrons. Removing two electrons from Xenon creates the Xe+2 ion, which has the electron configuration 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s2 5p5. This electron configuration is the same as Iodine (I) (Z = 53). So, Xe+2 is isoelectronic with I.
To find negative ions that are isoelectronic with Xe, we need to add electrons. Adding two electrons to Xenon results in the formation of Xe-2. The electron configuration of Xe-2 is 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s2 5p6 5d10, which is the same as Cesium (Cs) (Z = 55). Hence, Xe-2 is isoelectronic with Cs.
So, based on these explanations, you can see that Ar+2 is isoelectronic with Ne, Ar-2 is isoelectronic with Kr, Xe+2 is isoelectronic with I, and Xe-2 is isoelectronic with Cs.