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Question

The modern periodic table contains ___________ groups.


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Solution

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 to 18 replacing the older notation of groups IA … VIIA, VIII, IB … VIIB, 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 modern periodic table contains 18 groups.


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