Chapter 6, Problem 52A

Interpretation Introduction

Interpretation:

Whether any of the halogens have their valence electrons in orbitals of the same energy level or not needs to be determined.

Concept introduction:

A periodic table consists of groups and periods. The horizontal rows are termed as periods and the vertical columns are termed as groups. The elements with similar properties are placed together in a group. Each period has different energy levels.

Electronic configuration of an element is the arrangement of elements in different orbitals like s, p, d, f.

Answer to Problem 52A

Each halogen is located in different period. Due to this, each period has a different energy level and so no two halogens share same energy level.

Explanation of Solution

Each halogen is located in different period. Due to this, each period has a different energy level and so no two halogens share same energy level.

The table shows the electronic configuration of halogens and their energy levels.

Halogen	Atomic Number	Electronic Configuration	Group Number	Energy Level
Fluorine	9	[He] 2s2 2p5	17	2
Chlorine	17	[Ne] 3s2 3p5	17	3
Bromine	35	[Ar] 3d10 4s2 4p5	17	4
Iodine	53	[Kr] 4d10 5s2 5p5	17	5
Astatine	85	[Xe] 4f14 5d10 6s2 6p5	17	6

Conclusion

Since all the elements are located in different periods having different energy, hence, no two halogens share same energy level.