How many vertical columns are present in the modern periodic table?
Show answer & explanation
Correct answer: D
Explanation
The correct answer is option 4 i.e. 18.
In the modern periodic table, there are 18 vertical columns. These columns are known as groups or families. Elements within the same group share similar chemical properties and have the same number of valence electrons. The periodic table is organized into these groups to reflect recurring trends in element properties, such as reactivity and ionization energy. Each group has its own specific characteristics and behaviors, contributing to the overall organization and understanding of chemical elements.