Sort these species into isoelectronic groups. It doesn't matter which group goes in which box, so long as the correct species are grouped.
He, Li+, O^2-, Rb+, Se^2-, F-, Be^2+, Y^3, Mg^2+
Use a periodic table to determine the atomic number of the atom. For example, xenon's atomic number is 54. A neutral atom has the same number of electrons as protons. Therefore, Xe has 54 electrons.
Next, determine the number of electrons for each ion. Recall that a positive ion has fewer electrons than protons, and a negative ion has more electrons than protons. For example, iodine (I) has 53 protons and electrons. I- has gained one electron (negative charge), and therefore has 54 electrons.
Atoms and ions with the same number of electrons are isoelectronic. In this example, I- is isoelectronic with Xe.© BrainMass Inc. brainmass.com October 10, 2019, 5:24 am ad1c9bdddf
Please download the attached file.
He, Li+, Be^2+
O^2-, F-, Mg^2+
This solution helps sort ion species into isoelectronic groups.