1. Which one of the following elements has the largest radius?
O
F
Al
P
B
I put Al, and got counted wrong. Anyone explain? I dont understand why its wrong.
2. The electron configuration of the two atoms that form isoelectronic ions are _____.
Consider the following electron configurations to answer the questions that follow:
(vi) [Kr]5s1
(vii)[Ne]3s23p5
(viii)[Ar]4s2sd104p4
(ix)[Ne]3s23p6
(x)[Ar]4s1
A.(i) and (iii)
B.(ii) and (iii)
C.(iii) and (iv)
D.(i) and (v)
E.(ii) and (v)
Im not sure what answer this one is. I know that isoelectronic ions are ions that have the same number of electrons, but im not seeing it in this question.