Question

What are the salient properties of the modern or long-form periodic table?

Answer 1

Salient properties of Modern periodic table:

• “The physical and chemical properties of the elements are periodic functions of their atomic numbers”
• The horizontal rows are called periods while the vertical columns are known as groups.
• “According to the recommendation of the International Union of Pure and Applied Chemistry (IUPAC), the groups are numbered from $1\mathrm{to}18$ replacing the older notation of groups $\mathrm{IA}\dots \mathrm{VIIA},\mathrm{VIII},\mathrm{IB}\dots \mathrm{VIIB}\mathrm{and}0$”.
• There is a total of seven periods. The period number is the highest principal quantum number (n) of the elements in the period.
• Group 1 is identified as Alkali metals while Group-2 is Alkaline earth metals.
• Group 17 is known as the Halogen family while the elements of Group-18 are Noble gases.
• d and f block elements are transition and inner transition elements respectively.

The long-form periodic table is shown below: