Question

Which is the shortest period and longest period in the modern periodic table

Answer 1

Sixth period is the longest period in the periodic table with 32 elements.

1st period is shortest period in periodic table with 2 element

I hope it will help you

Answer 2

Answer:

In the modern periodic table, the shortest period is first period and the longest period is the sixth period.

Explanation:

• Periodic table is the tabular arrangement of chemical elements in which the elements are arranged in order to increasing their atomic number.
• In the periodic table the horizontal rows are called periods. While the verticals column are called groups.
• The elements present in the same group will have same valence electronic configuration and similar chemical properties.
• In a period from left to right, the number of valence electrons increase.
• The shortest period in the periodic table is 1st period. It has only two elements  Hydrogen (H) and Helium (He).
• The longest period is the sixth period. It has 32 elements in it from atomic number 55 to 86 (Cs to Rn). It has elements from s- block, Lanthanoids, transition metals and p-block elements.
• The seventh period also have 32 elements but the most of elements are undiscovered.