Ionic Radii and Isoelectronic Series

Are cations smaller or larger than its neutral state? Why?

Smaller because a loss of electron creates a stronger pull towards its nucleus

Are anions smaller or larger than its neutral state? Why?

Larger because it gained an electron which leads to more repulsion and a weaker pull towards its nucleus

What is an isoelectronic series? Can you give me an example with Ne?

Different atoms with the same number of electrons. Example with Ne is: N³-, O²-, F^1-, Ne, Na^+1, Mg²+, Al³+

How do we determine what atoms are bigger in an isometric series?

If they have more protons than its neighbors, then it results in a smaller radius.

Which is bigger in ionic radius from increasing order. Use periodic table:

K+, Cl-, S²-, Se²-

K —> 19 protons 18 electrons
Cl —> 17 protons 18 electrons
S —> 16 protons 18 electrons
Se —> Has a larger shell than the rest

K < Cl < S < Se