a) Define modern periodic law
b) The atomic number of an element 'X' is 20. To which group and period of modern periodic table it belongs ?

Open in App

Solution

a) According to the modern periodic law, the physical and chemical properties of elements are a periodic function of their atomic number. This means that when elements are arranged in the order of their increasing atomic number elements of similar properties will recur at regular intervals or periodically.
b) An element with atomic number 20 will belong to group 2 and period 4 of the modern periodic table.

Suggest Corrections

Similar questions

(a) State modern periodic law.

(b) How does the electronic configuration of the atom of an element relate to its position in the modern periodic table?

(d) Is it possible to have an element having atomic number 1.5 placed between hydrogen and helium?

(e) Name the scientist who prepared the modern periodic table.

An element having electronic configuration 2, 8, 18, 3 belongs to which group of the Modern Periodic Table?

16

Join BYJU'S Learning Program