Arrange the following species in order of decreasing size

[WK95]

Homework Statement

Arrange the following species in order of decreasing size (largest radius first):

Br-
Cl-
Ca2+
K+

Homework Equations

The Attempt at a Solution

Br- would get Kr's configuration, Cl- would get Ar's, Ca2+ will get Ar's, K+ will also get Ar's.

Ar has 98pm radii while Kr has 112pm.

Br- would be first for sure.

Homework Statement

A) linear
B) T-shape
C) octahedron
D) seesaw
E) square plane
F) bent
G) trigonal bipyramid
H) square pyramidal
I) trigonal pyramid
J) tetrahedron
K) icosahedral
L) None of the above
Enter two letters that correspond to PCl4+> and PCl6− in order, e.g. AB, DC, EA, etc.

Homework Equations

The Attempt at a Solution

PCI4+ is Tetrahederal/Tetrahedron
PCl6- is Octahedral/Octahedron

 

[Borek]

Anons are larger than cations, and comparing cations and anions in pairs is quite obvious.

Or: you already know Br is the largest, now just sort the rest. They have the same configuration, and the only thing that changes is the nucleus charge.