which of the following isoelectronic ions has the smallestradius? a.Se^-2 b. Br^

Question

which of the following isoelectronic ions has the smallestradius? a.Se^-2   b. Br^-1   c.Rb^+1    d. Sr^+2 the ion Sr^+2 is isoelectronic with ______ ? a. Ca       b.Kr    c. Ar    d. Zr if electrons in an atom have the lowest possible energies, theatom is in the a.ground state b.inert state    c.excitedstate   d.radiation-emitting state which of the following isoelectronic ions has the smallestradius? a.Se^-2   b. Br^-1   c.Rb^+1    d. Sr^+2 the ion Sr^+2 is isoelectronic with ______ ? a. Ca       b.Kr    c. Ar    d. Zr if electrons in an atom have the lowest possible energies, theatom is in the a.ground state b.inert state    c.excitedstate   d.radiation-emitting state

Explanation / Answer

1. The smallest radi are going to be the most positively chargedsince the nuclear charge will then be stronger and will pullelectrons closer, making the radius smaller. So, now we have tochose between Rb and Sr. The more to the left and up the periodictable we go, the smaller the radius. So, Sr is smaller than Rb, andSr 2+ has the smallest radius. D Sr 2+ is isoelectronic with Krypton (no not superman :) ) B Lowest possible energy is ground state.

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