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Question

In the long form of periodic table how many elements are in the:

Shortest period


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Solution

In the long for of the periodic table, 1st period is the shortest. The elements present in the first period are two i.e.; Hydrogen (H) and Helium (He).

  • Due to the least number of elements in a period, this period is called as the very short or the shortest period.
  • Period number 2 and 3 has eight elements each and are called as short periods.

Long form of periodic Table: In the long form of the periodic table, elements are arranged in the order of their increasing atomic number in the tabular form.

  • The horizontal rows are called as periods.
  • The vertical columns are called as groups.
  • It has 18 groups or families and 7 rows or periods.

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