What is a period in modern periodic table ?

Number of elements in 6th period of modern periodic table is __________

The starting element and last element in the largest period in modern periodic table are

How are the elements arranged into groups and periods in the modern periodic Table ? Elements in a group posses similar properties , but elements in a period do not show similarites in their properties . Why ?

Explain the construction of periods in Modern periodic table.

Answer the following question based on the values of the atomic radii of the elements of one of the periods in modern periodic table Li ( 152 ) , Be (111) B, (88) , C (77) ,N (74) ,o (66 ) and F (64) In the numerical listing of periods in the modern periodic table , what number was given to above elements ?

How many periods and groups are there in the modern periodic table ?

The ending element in any period in the periodic table is…………