# Arrange the following species in order of decreasing size

• WK95
H and B are in the same period and have a difference of one proton; I and Xe are in the same group and have a difference of one electron. Therefore, the order is Br- > Cl- > K+ > Ca2+. In summary, the correct order of decreasing size for the given species is Br- > Cl- > K+ > Ca2+. For the second part, the correct answer would be PC, as PCl4+ is tetrahedral and PCl6- is octahedral.
WK95

## Homework Statement

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

Br-
Cl-
Ca2+
K+

## 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.

## The Attempt at a Solution

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

Last edited:
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.

## 1. What is the purpose of arranging species in order of decreasing size?

The purpose of arranging species in order of decreasing size is to organize them in a way that allows for easier comparison and understanding of their relative sizes. This can help scientists make connections and draw conclusions about the characteristics and adaptations of different species.

## 2. How is the size of a species determined?

The size of a species is determined by measuring its length, height, or weight. This can be done using various tools and techniques, such as rulers, calipers, and weighing scales.

## 3. What is the significance of the order of decreasing size?

The order of decreasing size can provide insight into the evolutionary relationships between different species. Species that are closely related may have similar sizes, while species that are distantly related may have vastly different sizes.

## 4. What are some examples of species that can be arranged in order of decreasing size?

Examples of species that can be arranged in order of decreasing size include mammals, birds, fish, insects, and plants. Within each group, there can be a wide range of sizes, which can also vary between different species.

## 5. Are there any limitations to arranging species in order of decreasing size?

Yes, there are limitations to arranging species in order of decreasing size. This method only considers one aspect of an organism (its size) and does not take into account other important factors such as behavior, habitat, and genetic makeup. Additionally, the sizes of some species may vary due to factors such as age, diet, and environment.

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