What is periodicity in elements?
The repetition of chemical properties in elements after certain regular intervals, when the elements are arranged in order of increasing atomic number, is called periodicity.
(a) What is the main characteristic of the last elements in the periods of the periodic table? What is the general name of such elements?
(b) What is the number of elements in (a) 1st period, and (b) 3rd period, of the modern periodic table?
What is the main characteristic of the last elements in the periods of a periodic table ? What is the general name of such elements ?
What is the cause of periodicity of elements in the Periodic table?
What is a periodic table? How many elements are there in a periodic table?