
Interpretation: This is to be explained how similarity between the elements in vertical column is related to their similar chemical behavior and electron configuration.
Concept introduction: Valence electrons are the electrons that occupy the outermost shell(highest energy level).

Answer to Problem 3RQ
It is because each element have same number of outer electron. So they have similar electron configuration.
Explanation of Solution
In the periodic table the vertical columns show the similar chemical property because the outer electron are same for each element. So valence will be same for each element.
Let us take the example of Sulphur and Oxygen
Both the elements have outer electron 6.
Chapter 11 Solutions
World of Chemistry, 3rd edition
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